First-Order Ambisonics Sound EFfects Library


A unique Mid-Side collection of ocean sounds


Original Ambisonics recordings of passenger and freight trains

logogrande Unidentified Sound Object (also called U.S.O., pronounced /ˌjuː.esˈəʊ/ /-ˈoʊ/) is an independent sound effects library publisher. It was founded in 2011 by Matteo Milani. As a post-production audio specialist, Matteo still explores creative opportunities both in the studio and in the field, inventing exclusive sfx libraries sold exclusively through A Sound Effect, the world's largest catalog of independent sound effects. The packages contain a wide variety of bizarre and unconventional sources: materials generated through analog and/or digital synthesis, or recorded with custom miking techniques. All of the audio files have been loudness-normalized and embedded with metadata for detailed and accurate searches in your software asset management.


Mexican Seaside

Mexican Seaside

Mexican Seaside is a unique Mid-Side collection of ocean sounds gathered during the summer of 2017 in the Yucatán Peninsula – Mexico. It contains sandy and rocky beach ambient sounds, with no human activity.

These sounds were recorded at sunrise (on various days) with a Zoom H6 on a Joby GorillaPod and a MS capsule (MSH-6) covered by a Rycote Mini Windjammer.

The package contains a MS-RAW folder plus a LR folder with all the files decoded to stereo for quick use.

100% of “Mexican Seaside” SFX library purchases will be donated to UNICEF México to provide aid and assistance to families affected by the recent earthquakes.



Runaway Trains


Warped Choir

Imagined Spaces – REmatrix Expansion library


3Dimensional Printing

The Complete U.S.O. Bundle

Transmission Apparatus

Unseen Noises

Hologram Room – vol.1

Kyma Ambiences – vol. 1



For Kyma users only: drumsFormer

drumsFormer is quite simple but colourful convolution based stereo Kyma […]

2017 / 08 / 29
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U.S.O. Tilt EQ now available in Kyma

Now you can boost and cut in Kyma with a […]

2017 / 04 / 13
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Warped Choir - a filmic sound construction kit

Featured: Warped Choir review

Check out The Audio Spotlight’s review of ‘Warped Choir’ by […]

2017 / 04 / 03
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Warped Choir - a filmic sound construction kit

OUT NOW: Warped Choir

‘Warped Choir‘ is the latest state-of-the-art filmic sound construction kit […]

2017 / 03 / 07
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Recording Magazine

Review: Imagined Spaces

Overloud REmatrix convolution reverb and Imagined Spaces IR Pack have […]

2017 / 02 / 10
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Over the last 20 years, my creative background in different disciplines of sound - from advertising for television and radio to cinema and mobile applications - has led me to an openness to a variety of ideas and sound styles.

I collaborated successfully with Italian and European directors, working on hundreds of TV and radio spots, developing a deep sense of storytelling.

I worked as a sound designer and re-recording mixer on several documentaries and feature films, such as “Rosso Fango” - a short war movie which won the “David di Donatello” prize in 2003 and “Yuri Esposito”, screened at the 70th Venice International Film Festival.

I wrote for renowned italian audio magazines and built an international sound community in the blog “Unidentified Sound Object”.

In addition to producing and delivering innovative sound effects libraries, I offer music consultancy for audiovisuals and compose experimental music and develop surround-sound for multimedia installations and live events.


Our flexible 5.1 and Stereo mix room offers a well-selected combination of analogue and digital equipment in a great sounding space. It's a powerful mix suite with great views and a flood of natural light. Including a small isolation booth designed to record voice actors or single instruments, it’s the perfect room for film soundtrack and surround mixes.


licenseYour purchase of any sound library grants you a lifetime non-transferable worldwide license for synchronization rights only. You are allowed to create a single working copy of all sounds contained within the product to store as a backup. The sounds are to be used only for the authorized purposes as defined in the End-User License Agreement. Every purchase of our product includes permission for you to access the sounds from up to 1 workstations installed at 1 address location (on-site, the primary location or physical address of the Licensee, at which the hard disk or other storage medium is housed). There is no fee. If you have 2+ users or require networked access to our sound effects libraries, you will need to obtain a special multi-user license not covered in the standard single user EULA. Multi-User Licensing is available upon request.


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