Leaving the keyboards, analog synthesizers on the side, I confess it was Wind synthesizers, Wind controllers - AKAI EVI+ analog sound module, Yamaha WX7… the entry point for “more expressive” this was 1990 (coming from the acoustic, brass/wind instruments families ) Turn full circle 1
No stranger to splitting MIDI ch and “combining” notes with MIDI CC ( Oberheim always allowed great flexibility/ poly aftertouch; ahah I recall having a guitar Roland GR-707/GR700 with is independent Multi-channel - 6 MIDI ch)
Always the pursuit of suited sound sources, more expressive?? - (favourite = physical modelling ( Yamaha VL-1m, Nord G2, Korg Prophecy)
Coincidence? this day, 13 years ago I got my first Eigenharp Pico (Silver ehehe everyone seem to got the black version), really as a: hey its a new year, (2010), and it has a breath pipe!! why not!
I have used it in countless shows, performances, studio experiments, always loyal and dependable, witnessing the ever growing computer and software science; I was lucky enough to have gotten an Eigenharp Alpha by the end of that year, I wish I had used it more often in live situations.
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2014 My Haken Continuum changed so many aspects of of my composition, sound design, MIDI data, play surface, integrated sound source also providing it to other controllers = LinnStrument, Joué, Erae Touch
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Osmose - add keys to the EaganMatrix synth engine like Expressive E has done…
The rewarding experience everyone is involved, musician/composer versus listener with access to more control and the choice/freedom one gets not by using a note with X pressure Y timbre and some bit of “pitch deviation” but just the right amount that exact moment one chooses playing!
Internet; fast communication - more recently platforms like Kickstarter, jump start new ideas… (not entirely “bullet proof” but…)
more collaborations? Osmose is a good example! hopefully a long lasting one 
Software = “magic glue”? ones and zeros, 110010 that gives live to hardware; interface to humans? Don’t get me wrong here, think we come a long way forward…
Sad this is writing a monologue, or else probably I would get with a bottle in the head (hopefully one of those cinema props made of sugar 