Roland SH-4d Digital Desktop Synthesizer - Manual (Page 120)

MFX Parameters
120
T-Scream
This models a classic analog overdrive.
It is distinctive in adding an appropriate amount of overtones without muddying the sound.
Parameter Value Explanation
Distortion
0–127 Degree of distortion
Also changes the volume.
Tone 0–127 Tonal character of the T-scream
Level 0–127 Output Level
Fuzz
Adds overtones and intensely distorts the sound.
Parameter Value Explanation
Drive
0–127 Adjusts the depth of distortion.
This also changes the volume.
Tone 0–100 Sound quality of the Fuzz effect
Level 0–127 Output Level