This was just an example.
What do you want with velocity?
What organ plugin supports velocity and what can you control with it?
Anyway here is is small script where you can map velocity to a CC number you set with the scriptlet parameter.
var v_vel : Integer
v_cc : ControlChangeMessage
p_cc : Subrange Parameter 1..127 = 1
//Called when a NoteOn message is received
On NoteOnEvent(m : NoteMessage)
v_vel = GetVelocity(m)
v_cc = MakeControlChangeMessage(p_cc,v_vel)
SendNow(m)
SendNow(v_cc)
End
Just create a scriptlet, use the above code and connect the scriptlket between your MIDI In Block and your normal plugin
The Scriptlet Parameter you can map to a widget in the rackspace panel.