VM-3100PRO: Using a Compressor
a compressor and adjust the settings:
1) While holding SHIFT, press COMP1 or COMP 2 so it is lit.
2) Use the value knobs [V1] - [V4] to adjust the compressor settings.
NOTE: The following settings can be adjusted with the value knobs:
V1 - Threshold Level
V2 - Attack Time
V3 - Release Time
V4 - Ratio