Hi, very simple. Just choose an unused CV-out and configure it as “Velocity” and choose the velocity source from another channel.
Midi in channel 1
Gate-out: Midi gate
Midi-in channel: OFF
Velocity from: channel 1 (for channel 3) and ch 2 for channel 4
If you install firmware 2.06, you can also see the velocity output as a bargraph in the main menu.