When applying aftertouch, it creates a negative swell (decreasing volume). This is counter-intuitive to me. I understand Hammond organs likely had no aftertouch, but other synths I have used, normally aftertouch mapped to volume or CC 11, or a filter, normally increases volume and/or brightens timbre. I have gone into expert mode settings and looked at the amplifier modulator settings and the best I can do is minimize the negative swell by changing the MIDI CC 11 slider to the left (-) 0.0% and/or press Invert button.
Anyone have any ideas?