I don't own an Andromeda (yet) but from looking at the reviews and user's manual, I only see one knob for Modulation but no explanation for how a one knob modulation control works. The user manual seems to indicate that the knob simply controls the blend for how much modulation is mixed in. Does that mean you cannot control the rate of the modulation or the depth? Both the Dark Sun and Silver Lake allow independent adjustment of Mod Depth and Rate ... but I don't see anything on the front panel for rate/depth of mod.