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LFO in Reaper

you can apply a Low Frequency Oscillator (LFO) to any standard MIDI Continuous Controller (CC) lane (numbered 0 to 127) within the MIDI Editor.

To do this, you right-click over the CC lane panel area (the left side of the lane) and select LFO... from the menu.

List of Compatible CC Lanes and Data Types

While all 128 CC lanes are technically available for LFO application, the sources explicitly mention the following parameters and data types as compatible for modulation:

  • Standard CC Parameters (0-127):
    • Volume (CC 07)
    • Pan / Pan Position (CC 10)
    • Mod Wheel
    • Breath
    • Portamento
    • Balance
    • Expression
    • Sound Parameters: Release, Attack, and Brightness (filter cutoff)
  • Other MIDI Data Lanes:
    • Pitch Wheel (Note: A specialized "JS: MIDI Pitch Wheel LFO" also exists for "pitch wobulator" effects)
    • Aftertouch
    • Channel Pressure
    • Program Change

Specialized LFO Tools

Beyond the standard MIDI Editor LFO, the sources highlight PADRE's LFO Generator (part of the SWS Extensions), which offers expanded targets:

  • Take Envelopes: You can apply LFOs to Pan, Volume, or Mute for selected MIDI takes.
  • FX Parameters: You can target any track or FX parameter envelope (e.g., EQ gain or compressor threshold).

Important Distinction: Velocity

The sources note that Velocity is an exception to the standard CC behavior. Most CC events are displayed as linear or curved envelopes, which are ideal for smooth LFO curves. Velocity, however, consists of discrete values tied directly to individual notes rather than a continuous stream of data. Therefore, while you can manipulate velocity, it does not function as a continuous LFO envelope in the same way as controllers like Volume or Panning.

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