Controls: Edit Menu >> Synth Controls >> Velocity
Macro: SynthVel
This simulates the velocity of a synthesizer keypress, to
provide a crude rise-time control on voices that actually make
use of the Velocity function. But musical instrument attack
times are typically slower than are useful for most test
signals, so you will probably want to keep this at its default
maximum value of 127.
See also Synthesizer Control Dialog.