10 Essential Tips for audio freelancers Asbjoern Andersen


Planning to go freelance in game audio – or perhaps you already work as a freelancer? Rebecca Parnell is a BAFTA Award-winning Sound Designer who has worked in sound for 19 years on 50+ game titles, and has been working freelance for the past 10 years – and in this special guide, she shares her essential tips to a succesful freelance career in game audio.


Written by Rebecca Parnell, photo courtesy of Rebecca Parnell



 

Going freelance is a bold and exciting step in one’s career that can be hugely rewarding. It can also be very demanding, and despite the dream of freedom away from the office, designing sound on a beach in Thailand, the reality often requires perseverance, commitment and work infringing on personal time and home space… With that said in quiet times, there is the wonderful possibility to pack up the recording kit and go exploring!
If you are considering making the move to freelance or have just embarked on this journey, here are some top tips to making it a success!

1. Start with in-house experience


A significant part of designing audio in interactive media is the implementation. No matter how amazing your thoughtfully crafted sound is, if it is implemented badly, it can sound really bad.

Having the experience of working in-house throughout the development of a game will enable you to communicate and work more effectively remotely

You need to be equipped to know how the game developers operate, what the different roles in the team are, how your work overlaps and how you can help each other. There is so much to learn! Having the experience of working in-house throughout the development of a game will enable you to communicate and work more effectively remotely. I still very much enjoy in-house contracts from time to time.
 

2. Build your network


There is no better way to find work than to be recommended. Working in-house is a great way to build your network. If a previous colleague remembers your awesome sounds on a project and that you are thoroughly nice person to have on the team, they might recommend you in the future. If you build a good relationship with your clients, they’ll come back to you for their next project. Attending conferences, exhibitions and networking events are also great ways to meet others in the industry, share opinions, stories and meet like-minded people.
 

3. Establish your legal framework and contact the tax office


There are various ways in which you can operate as a freelancer: a sole trader or a director of a limited company, whether registered for VAT or not. Each country has their guidelines, rules and rates. It’s worth doing your research and getting this established from the start. If you are to make a limited company, you’ll need a company number on your quotes and invoices, the same with VAT if you are to register. Also consider whether you require an accountant, they might seem expensive but they might know how to best to manage accounts that frees up more cash to invest in your company.
 

4. Create a suitable space to work


This is really important as you’ll be spending a lot of time there.

Wherever possible have a room that you enter to work and close at the end of the day, making a clear division between work and personal space

Whether you hire a room at a studio, build your own home studio, or adapt a space in your home, it needs to be quiet, without distractions and comfortable. Wherever possible have a room that you enter to work and close at the end of the day, making a clear division between work and personal space.

[tweet_box]10 Essential Tips for Game Audio Freelancers[/tweet_box]  

5. Prioritise setting up expenditure


Of course we want all the wonderful toys in the shop, but what do we really need and how much can we afford? It takes time to establish a network of clients and contracts might be patchy in the earlier years, it’s good to have a financial buffer to keep you going. I would recommend starting with a decent workstation (computer and DAW), a good versatile microphone, a good listening environment (headphones or speakers with sound panels), and a handful of trusted plugins (my absolute musts are compression, EQ, reverb and delay). When new contracts come in, or invoices paid, you can slowly build on the plugins, libraries and other equipment.
 

6. Decide a visual identity


How would you like to present yourself? What is your market, who is potential clients? If you have a company what will you call it? What will the logo be like?

What’s your unique identity that makes you stand out?

Whether to be corporate or creative, broad in services or specialised, where best has your experience been and how can you expand on this? What’s your unique identity that makes you stand out? Questions, questions! All of this is worth thinking about when you design your website and branding, to represent your personality and skills. What best to present in your showreel that captures your audience before they click away. Social media sites like LinkedIn and Facebook are great ways to share your latest news and gently remind people you’re available. Endorsements and recommendations are a great way to validate your services to people who come across you for the first time.
 

7. Be organised – lists and logs


There is something very satisfying about crossing off a task from the list, especially if it’s the later part of a long list! Multiple projects and fast approaching deadlines can be stressful. Know what needs to be done and when, and don’t put it off, especially the boring stuff! There are plenty of free applications you can use – Google apps are fantastic: calendars, documents, spreadsheets can help you organise and keep track of your work and progress. Also, log your work and how much time you spent on it.

Know what needs to be done and when, and don’t put it off, especially the boring stuff

This helps with reporting back to your clients and detailing work on invoices. Keeping a record is great reference for when quoting for a new project, developing a better understanding of time required.


Popular on A Sound Effect right now - article continues below:


Trending right now:

  • ⏰ For a very limited time:
    Add this library to the cart and enter ah4launch in the cart coupon field – to sprinkle an extra launch discount, on top of the current discount!

    Animal Hyperrealism Vol IV is a sound library containing animal vocalisations, from real to designed creatures totaling more than 2000 individual sounds in 294 files. The sounds were recorded in zoos, and wildlife centers.

    The asset list includes but is not limited to: hippos, hyenas, vultures, dwarf mongooses, elephants, African cranes, parrots, tigers, pigmy hippos, rhea ostriches, brown bears, pheasants, wildebeests, African wild dogs and many more. The content has been recorded at 192KHz with a Sanken CO100K, an Avisoft CMPA and a Sennheiser 8050 for center plus two Sennheiser MKH8040 for stereo image.

    The resulting ultrasonic spectrum is rich and allows for truly extreme manipulation of the content.

    15 %
    OFF
  • Metal Sweeteners / Gun Hyper-Realism contains hundreds of metal sounds to enhance your gun fights.

    We recorded tons of different metallic objects like wrenches, cameras, stands, microphones,etc… to create different hits and textures for the Source Material kit, everything was recorded at 192 kHz with the famous Sennheiser MKH 8040/8050 microphones in order to capture all the harmonics up to 50-60 kHz.  Then we layered/edited/pitched, crushed them to create the sounds in the Designed folder.

    The “Source” folder contains 91 files and hundreds individual sounds divided into these categories:
    – Hit
    – Scrape
    – Screw
    – Rattle
    – Mech
    – Click
    – Slide


    The “Designed” folder contains 20 files and many more individual sounds, all created from the “Source Material”:
    – Silenced/Suppressed shots
    – Reload
    – Bullets
    – Mechanics
    – Ejections

    The “Synced” folder contains multiple groups of 8 layers + 3 silencers/suppressor, all sync’ed on some of the most common guns rate of fire :
    – Ak 47
    – M16
    – Uzi
    – MP5
    – M60
    – M4

    All the sounds are 192 kHz / 24 bits, giving you all the process flexibility you need. Most importantly the files are embedded with exhaustive metadata compatible with Soundminer, Basehead, etc…

    This library is perfect to spice up “boring” real life recordings, create a whole new futuristic weapon or just to give that ” Hyper Realistic ” feel to the project you’re working on.

  • Cold Weapon Sound Effects Ancient Armour & Weapons Play Track 1020 sounds included, 107 mins total $119

    Ancient Armour and Weapons is the result of months of recording, editing and arranging historic prop foley and combat sounds. This library is the first in an extensive melee and hand combat series by Black Edge Sound Studios (formerly Output Audio). Recorded at Universal Sound In Amersham, UK. A dedicated foley stage with a wealth of experience in crafting sound for feature film, TV and video games.

    The library has been designed to give sound editors and media creators some of the core audio elements needed to create epic sword fights, brutal melee conflicts and more; whilst proving multiple content options for editors to use either compiled sounds or original recordings from a choice of microphones. In addition to the search capabilities of the sound selection, care has been taken to arrange the recordings into a sequenced order. Multiple versions of each sound have been recorded in line so this content can be combined and layered easily.

    Background foley for mass groups has been provided with a selection of layers. These tracks can be panned to create 2.0, 5.1, 7.1 and up to 7.1.4 mixes.

    Content Groups Included:
    Blood, gore, swords, metal shields, wood shields, spear, axe, arrows, historic armour impacts, whoosh, body fall wearing period dress, mass group foley, prop impacts, metal scrapes and more.

  • Inspired by app market hits like Clash of Clans and Candy Crush, we present to you Mobile Game – a truly fun and genuinely gameplay inspired sound effects library. Filled with a thorough selection of popular game ready audio assets, Mobile Game gives you sounds that you can quickly implement inside any game to give it a familiar “hit app” game feel.

    • Includes 578 files
    • All files in .Wav 96k 24bit
    • Plus game ready mp3 files
    • Inspired by today’s best App Games
    • Includes Soundminer metadata
    • 891.9 MB of samples
    Mobile Game features sounds such as:

    Bubbles • Building • Coins • Crafting • Mechanisms and Contraptions • Musical Stabs • Objective Completes • Pick Ups • Potions • Tonal Designed Organic fx • UI/Menu • Upgrades

    20 %
    OFF

Latest releases:

  • ⏰ For a very limited time:
    Add this library to the cart and enter ah4launch in the cart coupon field – to sprinkle an extra launch discount, on top of the current discount!

    Animal Hyperrealism Vol IV is a sound library containing animal vocalisations, from real to designed creatures totaling more than 2000 individual sounds in 294 files. The sounds were recorded in zoos, and wildlife centers.

    The asset list includes but is not limited to: hippos, hyenas, vultures, dwarf mongooses, elephants, African cranes, parrots, tigers, pigmy hippos, rhea ostriches, brown bears, pheasants, wildebeests, African wild dogs and many more. The content has been recorded at 192KHz with a Sanken CO100K, an Avisoft CMPA and a Sennheiser 8050 for center plus two Sennheiser MKH8040 for stereo image.

    The resulting ultrasonic spectrum is rich and allows for truly extreme manipulation of the content.

    15 %
    OFF
  • Weather Sound Effects Hyper Thunder Play Track 800+ sounds included $49.50

    Hyper Thunder is a colossal collection of thunder and lightning, 100% crafted from the ground up using innovative synthesized technics and props recordings. Not a single real life thunder recording was used. using synthesis and props manipulation crafted to deliver impact far beyond natural recordings. Built entirely from innovative synthesis and props recordings, this library pushes the boundaries of weather sound design—perfect for when you need the raw energy of a storm dialed up to cinematic extremes.

    Featuring over 800 files, Hyper Thunder spans everything from subtle distant rumbles and rolling thunder to razor-sharp lightning strikes and earth-shaking impacts. With both designed hits and source layers, you have full control—drop in ready-to-use power or sculpt your own stormscapes using the source recordings.

    Created in collaboration with Bruits.Studio’s Vincent Fliniaux and Tibo Csuko—longtime SoundMorph contributors to acclaimed libraries like Robotic Lifeforms 2 and WATER— Hyper Thunder blends technical mastery with bold creativity.

    Key Features

    • 800+ files of synthesized thunder and lightning
    • Both designed hits and source layers for full creative control
    • Covers subtle distant rumbles through to massive cinematic impacts
    • Crafted 100% from synthesis for a unique, larger-than-life sound
    • Perfect for film, games, trailers, and any project needing storm power
    • Created in collaboration with Bruits.Studio’s Vincent Fliniaux and Tibo Csuko (Robotic Lifeforms 2, WATER)

    From atmospheric detail to explosive drama, Hyper Thunder gives you thunder and lightning that are bigger, subtler, and more versatile than nature itself.

    50 %
    OFF
  • Dive into a world where sound shapes vision, with TRAILER IMPACTS that carve moments of intensity into the canvas of imagination. Feel the raw power of distorted explosions and the resonant clang of metal hits, each adding depth and drama to the unseen narrative. The sharp snap of percussive claps and the eerie resonance of a magnetic impact blend with the solid thud of wooden hits, crafting an auditory landscape ripe with tension and release. These sounds, each with their own story, merge to create a backdrop where every detail contributes to the unfolding of epic tales, inviting listeners to fill the silence with their own cinematic journeys.

  • A MEGA PACK of 450 handcrafted sound effects designed to take your projects beyond the ordinary. From sci-fi risers that stretch tension, to haunting horror stings, angelic swells, and mechanical whooshes that shake the air — every effect is built to elevate emotion and amplify impact. Inside the Mega Pack: 450 epic SFX – risers, stingers, drones, atmospheres & more. A rich blend of dark, magical, futuristic, and orchestral textures. Ideal for film trailers, video games, streaming, and immersive content. Sounds that add depth, drama, and cinematic scale instantly. Step into the world of sound that moves stories. Don’t just tell your story — let your audience feel every moment.

    49 %
    OFF
  • Ambisonic Sound Effects Sirens Vol. 3 Play Track 100 sounds included, 41 mins total $25

    Need to add urgency? Our siren library has you covered. Featuring police wails, ambulance highs/lows, historic air raid sirens, and epic sci-fi alerts. Ideal for action sequences, documentaries, and creating instant tension. Make some noise!

    Turn up the tension with Sirens Vol 3 – your ultimate toolbox for audio emergencies. This isn’t your average siren library. We’ve packed 100 authentic sounds with everything you need to create heart-pounding moments.
    What’s inside?

    • The Classics: Get all the essential wails, yelps, and high-lows from real police cars, ambulances, and fire trucks.

    • Global & Vintage Vibes: Spice things up with distinct European signals and epic vintage WWII air raid sirens for that historical feel.

    • Next-Level Realism: It’s not just about the sound, it’s about the scene. Choose from close-up blasts, dynamic pass-bys (with that cool Doppler effect), and distant city ambiance blends.

    • The Unique Stuff: Go beyond the ordinary with glitchy malfunctioning sirens, old-school hand-cranked sounds, electronic whoops, and a killer selection of sci-fi and fantasy alarms for your game or film.

    Perfect for building: cinematic car chases, gritty urban environments, intense disaster scenes, and any project that needs a serious shot of adrenaline.

    Stop searching and start creating. Find your perfect siren sound right here.

    50 %
    OFF
Need specific sound effects? Try a search below:


8. Do your research and be confident in what you charge


Think about how you would like to charge for a project, your clients may wish you to charge on a per SFX basis but if you are overseeing implementation too, how is that worked in? Most audio professionals now prefer to opt for a day rate. Be careful when working out your day rate, some “useful” on-line calculators just divide your current salary by 365 days! Think about tax, in the UK, employers part pay their employee’s tax.

Be careful when working out your day rate, some “useful” on-line calculators just divide your current salary by 365 days

Think about sick days, holidays, expenses (equipment, rent and rates), and your availability (without employment security it is a reasonable expectation for you to build a financial buffer for the quiet periods between contracts). Do your research, have a look at what agencies are offering for similar roles and compare. Once you’re comfortable with a figure – be confident! If you are in talks with potential client, they’re likely to be impressed with the examples of your work and recommendations they have seen. If they do want to work with you but find your figure too high, they’re likely to negotiate to find a compromise. If you are turned down, ask for feedback, always better than second guessing.
 

9. Build good client relationships


Unfortunately with the nature of game development, audio can be forgotten. The team is working together in an open plan office, when checking their work the in-game the sound might be off. In reviews the team might talk enthusiastically over the game audio. If there is not an in-house audio person/team present they might not know the powerful use of audio, the aesthetics approaches that can be taken to bring the experience more to life. It’s your job to show them what can be done, get them excited and on board with your ideas, ask them for feedback! You are however also reliant on them, without their help you might have difficulty getting some or all of your sounds implemented correctly. Unfortunately at times a producer or project manager has to prioritise tasks to reach a release date, and need to juggle resource with requirements across the team. Understand this and prioritise yours, think how best to work effectively and pick your battles.
 

 

10. Enjoy it.. and living life too!


It is wonderful, to establish a career doing what we love, every day something to look forward it, and even the boring tasks are satisfying because they are our own – masters of our destiny! However take heed, it’s easy for work to take priority and can become all too consuming.

However take heed, it’s easy for work to take priority and can become all too consuming

Don’t be afraid to book a holiday, it might sound daft but it can be easy to put off to a more convenient time. Take time off; spend it with family, friends, get away from the screen and to the great outdoors! Exercise, travel, read, learn, listen and enjoy the arts. All this wealth of experience and from the stuff of life makes your creative output all the richer when back at in the studio.

 

A big thanks to Rebecca Parnell for her freelancing tips!

 

Please share this:


 

 

About Rebecca Parnell

Rebecca Parnell is a BAFTA Award-winning Sound Designer, having worked in sound for 19 years on 50+ titles, covering the most popular platforms of the time.

Rebecca started her career in game audio as a Sound Designer for Richard Joseph’s audio outsource company Audio Interactive at Pinewood Studios, working with many developers including Sensible Software, Codemasters and EA/Bullfrog. She moved to work in-house at VIS entertainment, Criterion Games and Outerlight before going freelance in 2007, and in 2009 launcher her company Magicbrew, working with developers NaturalMotion, Hello Games, Wonderstruck, Space Ape, Microsoft Lift and more.

Rebecca has judged for the prestigious BAFTA Game Awards and the Music and Sound Awards, and guest lectured at the National Film and Television School.

Rebecca has also branched out to work in film, having edited sounds for several shorts and a feature, most notably Babak Anvari’s BAFTA nominated short Two and Two.

When Rebecca is not working she is often out exploring with her recording kit collecting inspiring sounds. Whether that’s in the streets of her home city London, in Brazilian jungles, the markets of Marrakesh or visiting a hill top tribe in Laos to identify bird calls, she is always keen to explore the aural world.

 


 

 
THE WORLD’S EASIEST WAY TO GET INDEPENDENT SOUND EFFECTS:
 
A Sound Effect gives you easy access to an absolutely huge sound effects catalog from a myriad of independent sound creators, all covered by one license agreement - a few highlights:

  • ⏰ For a very limited time:
    Add this library to the cart and enter ah4launch in the cart coupon field – to sprinkle an extra launch discount, on top of the current discount!

    Animal Hyperrealism Vol IV is a sound library containing animal vocalisations, from real to designed creatures totaling more than 2000 individual sounds in 294 files. The sounds were recorded in zoos, and wildlife centers.

    The asset list includes but is not limited to: hippos, hyenas, vultures, dwarf mongooses, elephants, African cranes, parrots, tigers, pigmy hippos, rhea ostriches, brown bears, pheasants, wildebeests, African wild dogs and many more. The content has been recorded at 192KHz with a Sanken CO100K, an Avisoft CMPA and a Sennheiser 8050 for center plus two Sennheiser MKH8040 for stereo image.

    The resulting ultrasonic spectrum is rich and allows for truly extreme manipulation of the content.

    15 %
    OFF
  • Genres Vintage Anime SFX Play Track 350+ sounds included $69

    The Vintage Anime Sound Effects Library brings all of the excitement of your favorite Japanese animated series to your fingertips. Inspired by classic cartoons from the 80’s and 90’s, these recognizable and versatile sounds will instantly enhance any FX collection. Vintage synths were used to create the auras, beams, mecha blasters, atmospheres, magic spells, guns, sonic blasts and explosives that makeup this pack of over 350+ custom 24bit/96khz .WAV files. Perfect for film, video games, podcasts and any project that could benefit from a power up!

    Both designed sounds and source recordings:
    • Classic anime sfx from the 80’s and 90’s

    • Auras, mecha, beams, blasters, spells, explosives and more! 350+ sounds!

    • Tons of source material for experimentation

    • Expert crafted metadata

    • Vintage Anime PDF

  • This is a sound library containing the sounds of driving on various materials as well as screeching skid sounds.

     

    The contents in this library represent the sound of the interaction between the tires and the surface being driven on, as opposed to the sound of the engine.

     

    Includes the sound of driving on:

    • Asphalt (wet and dry)
    • Gravel
    • Grass
    • Dirt
    • Mud
    • and more!

     

    Features:

    • 71 audio files in 24 bit 96kHz WAV format
    • All files are metadata-tagged, allowing for easy searching in sound library management tools
    • UCS compliant file naming
    • Available for commercial or personal use without attribution

     

    View a summary of included sounds here

    View a full list of included files here

Explore the full, unique collection here

Latest sound effects libraries:
 
  • ⏰ For a very limited time:
    Add this library to the cart and enter ah4launch in the cart coupon field – to sprinkle an extra launch discount, on top of the current discount!

    Animal Hyperrealism Vol IV is a sound library containing animal vocalisations, from real to designed creatures totaling more than 2000 individual sounds in 294 files. The sounds were recorded in zoos, and wildlife centers.

    The asset list includes but is not limited to: hippos, hyenas, vultures, dwarf mongooses, elephants, African cranes, parrots, tigers, pigmy hippos, rhea ostriches, brown bears, pheasants, wildebeests, African wild dogs and many more. The content has been recorded at 192KHz with a Sanken CO100K, an Avisoft CMPA and a Sennheiser 8050 for center plus two Sennheiser MKH8040 for stereo image.

    The resulting ultrasonic spectrum is rich and allows for truly extreme manipulation of the content.

    15 %
    OFF
  • Weather Sound Effects Hyper Thunder Play Track 800+ sounds included $49.50

    Hyper Thunder is a colossal collection of thunder and lightning, 100% crafted from the ground up using innovative synthesized technics and props recordings. Not a single real life thunder recording was used. using synthesis and props manipulation crafted to deliver impact far beyond natural recordings. Built entirely from innovative synthesis and props recordings, this library pushes the boundaries of weather sound design—perfect for when you need the raw energy of a storm dialed up to cinematic extremes.

    Featuring over 800 files, Hyper Thunder spans everything from subtle distant rumbles and rolling thunder to razor-sharp lightning strikes and earth-shaking impacts. With both designed hits and source layers, you have full control—drop in ready-to-use power or sculpt your own stormscapes using the source recordings.

    Created in collaboration with Bruits.Studio’s Vincent Fliniaux and Tibo Csuko—longtime SoundMorph contributors to acclaimed libraries like Robotic Lifeforms 2 and WATER— Hyper Thunder blends technical mastery with bold creativity.

    Key Features

    • 800+ files of synthesized thunder and lightning
    • Both designed hits and source layers for full creative control
    • Covers subtle distant rumbles through to massive cinematic impacts
    • Crafted 100% from synthesis for a unique, larger-than-life sound
    • Perfect for film, games, trailers, and any project needing storm power
    • Created in collaboration with Bruits.Studio’s Vincent Fliniaux and Tibo Csuko (Robotic Lifeforms 2, WATER)

    From atmospheric detail to explosive drama, Hyper Thunder gives you thunder and lightning that are bigger, subtler, and more versatile than nature itself.

    50 %
    OFF
  • Dive into a world where sound shapes vision, with TRAILER IMPACTS that carve moments of intensity into the canvas of imagination. Feel the raw power of distorted explosions and the resonant clang of metal hits, each adding depth and drama to the unseen narrative. The sharp snap of percussive claps and the eerie resonance of a magnetic impact blend with the solid thud of wooden hits, crafting an auditory landscape ripe with tension and release. These sounds, each with their own story, merge to create a backdrop where every detail contributes to the unfolding of epic tales, inviting listeners to fill the silence with their own cinematic journeys.

  • A MEGA PACK of 450 handcrafted sound effects designed to take your projects beyond the ordinary. From sci-fi risers that stretch tension, to haunting horror stings, angelic swells, and mechanical whooshes that shake the air — every effect is built to elevate emotion and amplify impact. Inside the Mega Pack: 450 epic SFX – risers, stingers, drones, atmospheres & more. A rich blend of dark, magical, futuristic, and orchestral textures. Ideal for film trailers, video games, streaming, and immersive content. Sounds that add depth, drama, and cinematic scale instantly. Step into the world of sound that moves stories. Don’t just tell your story — let your audience feel every moment.

    49 %
    OFF
  • Ambisonic Sound Effects Sirens Vol. 3 Play Track 100 sounds included, 41 mins total $25

    Need to add urgency? Our siren library has you covered. Featuring police wails, ambulance highs/lows, historic air raid sirens, and epic sci-fi alerts. Ideal for action sequences, documentaries, and creating instant tension. Make some noise!

    Turn up the tension with Sirens Vol 3 – your ultimate toolbox for audio emergencies. This isn’t your average siren library. We’ve packed 100 authentic sounds with everything you need to create heart-pounding moments.
    What’s inside?

    • The Classics: Get all the essential wails, yelps, and high-lows from real police cars, ambulances, and fire trucks.

    • Global & Vintage Vibes: Spice things up with distinct European signals and epic vintage WWII air raid sirens for that historical feel.

    • Next-Level Realism: It’s not just about the sound, it’s about the scene. Choose from close-up blasts, dynamic pass-bys (with that cool Doppler effect), and distant city ambiance blends.

    • The Unique Stuff: Go beyond the ordinary with glitchy malfunctioning sirens, old-school hand-cranked sounds, electronic whoops, and a killer selection of sci-fi and fantasy alarms for your game or film.

    Perfect for building: cinematic car chases, gritty urban environments, intense disaster scenes, and any project that needs a serious shot of adrenaline.

    Stop searching and start creating. Find your perfect siren sound right here.

    50 %
    OFF

   

One thought on “10 Essential Tips for Game Audio Freelancers

Leave a Reply

Your email address will not be published. Required fields are marked *

HTML tags are not allowed.