Unidentified Sound Object (U.S.O.) is an independent sound effects library publisher serving a worldwide clientele. Founded in 2011 by Matteo Milani, with over 20 years of experience in advanced sound design, U.S.O. offers high-quality, commercially-usable sound libraries. Matteo specializes in post-production audio, continually crafting innovative sound effects libraries featuring both analog and digital synthesis, and unique recording techniques. All files are tagged with detailed metadata for easy searching and conform to the Universal Category System for sound classification.

Listen to Those Who've Chosen Us

How wonderful is your idea of breaking sounds into layers. The problem with libraries is they lock you into someone else’s idea. If you can give flexibility on how sound pieces can be assembled that is so cool, and unique in libraries. - Gary Rydstrom

Your library is super impressive... blown away really. I just loaded up the Radium patches... crazy good! You've done some great creative work there, chef's kiss! - Justin Drury

Thanks for sharing all of the ins and outs of creating this library. HUGE undertaking, but fantastic results! - Chris Stangroom

I have got 2 of your libraries, they are both one of my favourites, can’t get my fingers of them and use them (nearly) everywhere! - Lars Fischer

Can't wait to check it out!!! As soon as I heard the demo on designing sound I didn't even listen to the whole thing before I snagged it! - Chris Fonte

Nice library of stuff! - David Farmer

Look forward to more libraries you'll have to offer in the future. I've been impressed. - Ryan Bloomer

Just grabbed Unseen Noises. Great stuff. Wow. - Kelly Pieklo

Thank you for these awesome sounds! - Franz Danksagmüller

Keep up the great work with your sounds, loving the unusual stuff you do!!! - Byron Bullock

We're launching something new on A Sound Effect – and we can't wait to share it with you!

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