To be able to control the "Veltrack" opcodes with CC is a flexible option, for example, for adjusting velocity response via GUI based on each piano player's hands strength/habit, and more other cases.
Currently ARIA support amp_veltrack_onccN
I also suggest to add the other two as well :
fil_veltrack_onccN and pitch_veltrack_onccN

• amp_veltrack_onccN
• fil_veltrack_onccN
• pitch_veltrack_onccN