It looks like there are two playable ways of working with the Qunexus
1. Assign pitch bend to the pitchbend controller, set the range to 12 octaves to resolve the resolution bug in the firmware, and then assign modulation to keyboard tilt.
2. Assign modulation to the pitchbend controller (using either its tilt or pressure sensitive modes) and then assign pitchbend to keyboard tilt.
I have not yet figured out how to also use key pressure at the same time (e.g for filter cutoff) - but I am looking at this.
My focus is not how to do that - obviously that's configurable in the Qunexus editor. Its how to do these things and actually have a playable instrument. With the standard firmware that's not really possible, but as I've already discussed in another thread, it's possible to process the MIDI messages from the Qunexus to work around some of the limitations.
For option 2 the JS plugin I've already posted solves the tilt issue by only sending bend events from after the player tilts the key across the 'neutral' untilted point, and auto-cancelling pitch bend on any subsequent note down.
I have been experimenting this weekend with option 1 and I now have a JS plugin for that scenario. In this case we don't want to manipulate pitchbend events since the dedicated controller is quite manageable in tilt mode once you practice a bit (and, as I said, set the range to 12 semitones to avoid the firmware losing resolution). However, MIDI processing is required to ensure that modulation is musically controllable using tilt. Without that processing, you will find it very difficult to controllably add modulation. This is because, particularly when playing both black and white notes rapidly, controlling the exact spot at which your finger hits a note is difficult and introducing some initial tilt is almost unavoidable.
Fortunately, this is fixable with some MIDI pre-processing. Unlike pitchbend, though, the optimal algorithm appears to be a little different. Record the original tilt position and then if the player tilts the key further away (i.e to increase the tilt), then start outputting modulation values. As with pitchbend, auto-cancel modulation on any subsequent note on event.
This greatly improves playability since now you need to deliberately tilt a key further away to invoke modulation, rather than have it just be based on the current tilted position, which is difficult for the player to control.
I will post the JS plugin for this mode of operation shortly.
I have also figured out now how to get fairly good velocity response from the keys without too much mucking around and will post on my experiences there. So, rapidly turning from a high-tech toy to a musical instrument. Not quite there yet but I'm very impressed so far.