I really like the samson graphite 49. I use it currently with a modal synth, but Im curious how it would work with phi, I suspect very well because for the value it has pressure aftertouch, 2 banks of 8 sliders and one for volume, 16 function buttons, and two banks of 8 knobs, along with 4 percussion pads you maybe could route the piezo to [?].
Odd that Ive had my phi some months and havent tried using my graphite for it yet. Reason being id have to re-assign some of my midi cc most likely, and I kind of am 'used' to what I have it set up with.
Korg's nanokey studio however, I do also have, though its a bit small and only has velocity sensitivity and no aftertouch, it has 8 knobs, 8 pads an arpeggiator and an xy pad also. I think what I will try soon is connecting with this one.
I believe Aodyo made a youtube video featuring the phi, and the nanokey studio, although it was not too in depth it did show functionality of the knobs with some of the sound manipulations in the one shown.
Besides the graphite 49 I also have a beatstep pro, that actually could be a fun idea also.