Velocity is sent with MIDI Note On, so is not controllable via a CC. Even so, you can provide velocity functionality for external synths from the CC knobs. Assign MIDI velocity to one of the CC knobs so that the user can enter velocity value and channel as parameters. Enable the user to modulate the velocity parameter. The current value of that knob’s velocity overrides the default velocity and gets sent with the Note On.
In the track settings when using the external engine you can find min velocity (0) and max velocity (127). With this you can map how a notes db value as set in the note list maps to a velocity number.
I’ve updated the manual with a page on the external sound engine: External - PolyPulse manual
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