By the way, have you used the external input and envelope follower? Will external input gate the ADSR or does the filter cutoff always follow the shape of the input envelope? I’m wondering if I can feed it an octave/fuzz combo from my bass guitar and have the Pro 2 make that signal sound synthy.
What you would usually do after you connected an external source to the audio input and deactivated the internal oscillators is to assign the envelope follower to the VCA and the Filter Cutoff (whichever one you're using) in the mod matrix. In that case, the attack and release phase of the envelope follower will determine how the filter and VCA behavior is articulated over time. However hard or soft you hit the strings on your bass guitar will further influence the intensity of that articulation, so basically in the same manner as a velocity parameter would. I'd say this is the best way to do it if you wanna keep playing the bass in a typical manner.
An alternative to having the VCA being triggered by the envelope follower is to assign the external input to be the gate source under Misc Parameters. Then the external audio signal will immediately switch on or off the Pro 2's signal flow so to speak.
If you don't want the envelope follower to trigger the filter behaviour, but would like the filtered audio signal to follow the settings of one of the filter envelopes, then you can assign "Ext Audio In" to "Filter 1 Cutoff," for example, in the mod matrix. Leave the mod amount at zero. Then assign "F1 Env" to modulate the intensity of the previous modulation slot.
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