Is the IEM Plug-in Suite free and open source, and where can I download it?

Updated

Yes. The IEM Plug-in Suite is described as a free and open-source audio plugin suite, and it is distributed through a download/release page with source code also available. It includes Ambisonic plug-ins up to 7th order, created by staff and students of the Institute of Electronic Music and Acoustics. The latest version listed is v1.16.0, dated 30th September 2026.

What you get

  • Cost and licensing: Free and open source, per the project description.
  • Scope: Ambisonic plug-ins up to 7th order.
  • Origin: Created by staff and students of the Institute of Electronic Music and Acoustics.
  • Current version: v1.16.0, 30th September 2026.

Where to download

The suite is obtained from two places named on the site:

  • Download / Release Page — for the packaged release.
  • Source Code — for the source itself.

Both are listed alongside the latest version information, so you can choose the release build or build from source depending on your needs.

Before you update: breaking changes

The project warns that versions v1.16.0, v1.15.0, and v1.3.0 introduced breaking changes. Projects using an earlier version might not work as expected. If you are upgrading an existing project, check the Breaking changes article and the ChangeLog before committing to the update.

Featured plug-ins

The suite covers a range of Ambisonic and spatial processing tools, including:

Plug-in What it does
DualDelay Delay with sync-to-DAW, tap delay button, BPM-based times with multipliers, plus rotation and warping of the signal
GranularEncoder Ambisonic granular synthesis; turns any mono or stereo signal into an enveloping sound scene or microscopic particles
MultiBandCompressor Stereo-style multi-band compression that preserves the spatial image; splits the Ambisonic input into four individually compressible bands
StereoEncoder Encodes mono or stereo signals into the Ambisonic domain up to 7th order; sets orientation, width, and rotation, with Quaternion input for orientation trackers such as headtrackers
RoomEncoder Places a source and listener in a virtual shoebox-shaped room and renders over 200 wall reflections, useful for externalization in binaural playback

Practical notes

  • If you only need the plug-ins, the release page is the straightforward route; go to the source code if you want to inspect, modify, or build it yourself.
  • Because breaking changes affect project compatibility, keep a note of which version a project was made with before updating.
  • The Room Encoder is described as the most complex and computation-intensive plug-in in the suite, so plan CPU headroom if you use it heavily.