Dear Tony,
How true! An accel/retard button or wheel with adjustable ranges would definitely spice up the music.
Having a small disc-like device (much like that used by DJs) and/or a multi-directional joystick on our Technics instruments will also bring many possibilities. Such interfaces, unlike the tempo dial, can sense secondary qualities such as acceleration, decceleration, latency or other more complex gestures. Better still, how about motion sensing?
Pardon my occasional wishful thinking......
Khai
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Khai