JSFX procedural sound generator for REAPER

Version: v0.8.6
Author: 34birds

34birds 6-Voice Generator is a lightweight multi-oscillator sound generator built as a JSFX plugin for REAPER. Built as a pure JSFX (EEL2) plugin for REAPER

It is designed for:

• procedural sound design
• texture and drone generation
• tonal noise layers
• experimental synthesis

The instrument is fully self-contained and can be recorded directly to audio inside REAPER.

• 6 independent voices
• Waveforms: Sine, Triangle, Square, Saw, Noise
• Frequency range: 20–7000 Hz (log-scaled)
• Optional semitone quantization
• Smooth pitch automation
• Smoothed volume changes (no clicks)
• Automatic normalization by number of active voices
• Output fade-in on unmute
• Stereo output (mono source)
• Low CPU usage

Waveform
(optional noise shaping)
volume smoothing
sum of voices
auto-normalize
master
fade gate
output

• Output — On / Muted
• Master — Global volume (0–127)
• Quantize — Off / Semitone (12-TET)

• Waveform — Sine / Tri / Square / Saw / Noise
• Freq — Base frequency (20–7000 Hz, log-scaled)
• Vol — Voice volume (0–127, smoothed)

By default, REAPER tracks record Input, not FX output.

1. Arm the track.
2. Right-click the Record button.
3. Choose "Record: output".
4. Select stereo or mono.

Use the included track template.
It already has Record: output enabled.

Copy 34birds_6voice_generator.jsfx to:

macOS
~/Library/Application Support/REAPER/Effects/

Windows
%APPDATA%\REAPER\Effects\

Linux
~/.config/REAPER/Effects/

Then rescan JSFX in: Options → Preferences → Plug-ins → ReaScript / JS → Re-scan

The plugin will appear as: JS: 6-Voice Generator

1. Insert the generator.
2. Set Record: output.
3. Arm the track.
4. Record audio.
5. Adjust and repeat.

Free for personal and commercial use. No warranty.