Roland SH-4d Digital Desktop Synthesizer - Manual (Page 121)

MFX Parameters
121
Fattener (Tone Fattener)
This effect applies distinctive distortion, adding overtones to give more depth to the sound.
Parameter Value Explanation
Odd Level 0–400 [%] Raising the value adds odd-order overtones.
Even Level 0–400 [%] Raising the value adds even-order overtones.
Level 0–127 Output Level
HMS Distort (HMS Distortion)
This is a distortion-type effect that models the vacuum tube amp section of a rotary speaker of the past.
Parameter Value Explanation
Dist 0–127 Strength of distortion
Level 0–127 Output Level