I’m interested in trying out the Yamaha Reface CS. Annoyingly, the synth is not velocity sensitive when played standalone, but it sends velocity data, and responds to velocity data (https://www.youtube.com/watch?v=gFYUTidOggc).
Could I send note and velocity data from the Reface CS out to the Digitakt (1 or 2), and then map the velocity data to control note, volume and filter cutoff back on the Reface CS?
Or would I need a standalone midi processor like the Blokas Midihub to achieve this?
No.
Maybe, or a computer, but at that point shouldn’t you just purchase a keyboard which is sensitive to it’s own internal velocity?
The amount of cost, setup and hassle of purchasing and programming an external device and then using midi loopback just for this kind of basic functionality which is available by default in other comparably priced devices sounds ill advised.
If it’s your dream synth then yes, it’s probably possible, but velocity is part of the note packet data, it’s not a CC, so keep that in mind. You need a device which can specifically modify velocity data and turn it into CC data, not just something which can remap CC data into other CC data.
Yeah, looking it to it a bit more it seems like quite a painful way to achieve something so basic. Doesn’t seem worth it.
I know nothing about that keyboard.
But could you turn off Local, connect the MIDI out to the in?
Could also use a splitter (TRS or a MIDI split box) to keep a MIDI out?
Apologies if I’m barking up the wrong tree here…
I partially agree, sometimes not worth the hassle.
But I’d also add that sometimes I’ve done stuff like this, and made something crazy and unique.
You get the basic stuff up and running, it leads somewhere interesting. Worth a thought!
they said use velocity data to control note, volume, and filter cutoff back to the reface cs.
you might be able to turn local off and get velocity data back into the synth (which according to yamaha the CS can respond to velocity for note on messages), but you still could not modify velocity data into anything other than velocity data.
As said, I know nothing about the synths capability!
However, they did say it responds to velocity.
So at least you’d have volume?
For the cost of a midi cable?
What is the point of creating a synthesizer that generates and receives velocity but doesn’t utilize it internally? Wtf…
Yeah … can’t help feeling I’m missing something here ?
Ha ha… to fuck with us is my guess 
Don’t get me started on Korg’s MIDI implementation of the user Osc engine on the Minilogue XD. So fucking stupid!
Looked into it a bit… apparently it maybe does respond to velocity, a little bit (as volume).
Crazy that it you can’t control it though.
That engine in a bigger enclosure, more controls, would be a must-buy for many people. It sounds good!
Ah, interesting. Yamaha Reface CS synthesis engine is velocity sensitive - Gearspace
So it actually has some very slight velocity sensitivity. That’s even more frustrating 