A piano roll where every note can bend. Draw several voices, give each note its own pitch curve, and play the result as slides that cross, drift apart and come back together. PolySlide makes no sound of its own: it sends MIDI to a synth that understands per-note pitch, such as an MPE instrument.
The idea
On an ordinary piano roll, pitch bend belongs to the whole channel, so every held note bends together. PolySlide treats pitch motion as part of each note. Two voices can glide in opposite directions while a third holds still, because each note carries its own curve. That makes it a sketchpad for glissandi, unisons that drift out of tune and contrary motion.
