- controls the tone (bass/treble?)
- controls the turbo (?)
- controls the amount of overdrive
- controls the output level
The OD-04 imitates the sound of an overdriven tube amplifier. The outputsignal contains less harmonic components than a distortion-effect, parallel applying a slight compression and increased sustain. This produces a softer, clearer tone. The tone-control allows a wide range of sounds-from dark and mellow to bright and clear.