DAD 422
Audio Production III

Sound Particles: Optional Exploration

DAD 422 — Fall 2026

This is an optional extension to Surround mixing in REAPER . There is no separate submission. Start here after you can route, pan, and verify a 7.1 mix in REAPER.

Sound Particles places and moves sound sources in a virtual space, then renders the result through a virtual microphone system. Try it when a scene calls for a crowd, swarm, or many moving sounds rather than a single panning gesture.

You can request a student education license. Check the manufacturer’s education page for the current edition, renewal requirements, and permitted use. Interface labels and available formats vary by version; use the official manual for your installed version.

Start small and listen

  1. Choose one short source recording and audition it on its own.
  2. Open a template or a blank scene. Add the audio and a small particle group, then choose a starting region such as a sphere’s surface.
  3. Add a movement modifier and render a short preview. Compare it with the stationary version. What does the motion add?
  4. Try a random start delay to spread the entries over time. Change one setting at a time so you can hear its effect.

Use a modest particle count while learning. More particles can increase level and processing load without making the result more useful. If real-time playback drops out, render offline and audition that result.

Render for the playback system

The virtual microphone system determines the output representation. For this classroom, choose a channel-based 7.1 output and note the exported speaker order. Check the output level before auditioning in the room.

Export the microphone system’s rendered audio, import it onto an eight-channel REAPER track, and compare its channel labels with our room configuration. Route the finished speaker feeds directly to the verified eight-channel Master path. Do not treat the rendered 7.1 file as a new mono source in ReaSurroundPan.

If you choose AmbiX instead, note the Ambisonic order and normalization and use a matching decoder. Those channels are sound-field components, not eight speaker feeds. See the surround mixing lesson’s optional section for decoder choices.

Decide whether it helped

Compare the source and the spatial result at similar listening loudness. Can you describe a scene where the result would be useful? Does the movement remain clear, or do overlapping particles obscure it? Save one short test and your output-format notes if you want to return to the experiment.