Re V256 midi sustain (cc64) not working:-
I have the same issue. The V256 fails to respond to cc 64 sent on its default chan 16. The v256 does not sustain! Gender (cc23) works, Blend (cc20) works, Instrument Out Blend (cc 25) works.. But not Sustain (cc 64)!

I have also tried the v256 in omni mode (send cc 125, 0). In omni mode the v256 responds to other midi ccs such as mod (cc 1) and gender (cc 23) but NOT sustain (cc 64)

Note: I’ve checked these messages using midiox.. They are ok, in the case of sustain (cc64), the message controls other external midi driven equipment set to chan 16, but not the v256..

I’m guessing there’s either a piece of missing info in the midi handling setup or a bug.

Please let me know, how you will deal with this.
Thanks
Steve