This is pretty cool. Back when I was DJing I would have definitely bought this (and may yet, if I put my setup together again).
I'd suggest showing this working with Traktor or Serato - Ableton can functionally do something like this already (with Max/MSP) in which case you're competing on UI. This sort of thing is basically impossible in Traktor, last I checked, so you're bringing a much bigger improvement to those users. The live DJ market also benefits much more from improvements to their MIDI controls. If you make a demo video like Ean Golden does with the Midi Fighter [1] or NI does with Traktor [2] I think you'd see significant interest.
I'd suggest showing this working with Traktor or Serato - Ableton can functionally do something like this already (with Max/MSP) in which case you're competing on UI. This sort of thing is basically impossible in Traktor, last I checked, so you're bringing a much bigger improvement to those users. The live DJ market also benefits much more from improvements to their MIDI controls. If you make a demo video like Ean Golden does with the Midi Fighter [1] or NI does with Traktor [2] I think you'd see significant interest.
[1] https://www.youtube.com/watch?v=13AHLkIziNY
[2] https://www.youtube.com/watch?v=dEP4wF1hgrM