how to generate TS-A with Voyager RME?

I tried TS-A Input on VX-352 by a pedal. But no response.
As my understanding, I can use a Pedal or any CV into the VX-352’s TS-A and then output the TS-A from VX-351 to anywhere else.

And another question is that how to generate TS-A with RME, without the VX-352? Is there any MIDI CC I can use?

Sorry my stupid question. Basically I know what’s going on. Actually the X,Y and A always have their own destination. And every desti has it’s own MIDI CC. So that we can directly control them via MIDI CC.

But does it mean that the TS pots are not quite useful if common issues, especially the TS CV out on VX351?
Any one has the skillful experience about this?

One more question. Does anyone know where to get a x-y-z CV pad just like the pad on Voyager keyboard version? I searched some ribbon contoller like Deopfer R2M, but only 2 CV outs.

Thanks!