The Vapor fader refers to the stereo output of the crusher. In the I/O level view you can gauge the input. Note that the internal structures allow internal overload close to +40dB! Only the output levels should be under 0dB to prevent distortion.

The Dry fader refers to the dry sum of the input signal.

All volume faders are also morphed by the morph system which allows smooth fading and muting - even with a massive volume change resulting from using the undo/redo function or altering another parameter!