For a while I've been wanting to mention this as a very cool feature to have but I've been debating how useful it would be and... I eventually had to post about this feature request/suggestion.
Some Synth-based Bass sounds are begging to be "Played" with a MIDI keyboard
It would be so cool if some sort of MIDI Channel input assignment was possible to set on each Instrument's Pitch parameter (C3 would be Semi-Tone 0, maybe), so one could "play" that intrument/track/pad pitch with an external MIDI keyboard (or a DAW MIDI track)
...just a crazy idea for a future version of Spark that I had to put out