To me, basically, glitch is something uncontrolled and unexpected (and often profoundly interesting).
I didn’t have a lot of time, so I did a quick piano improv, trying to leave space for the electronics to answer.
My thought was that this would be a sort of call and response, with the piano exploring different versions of the call and the processed piano provided a steady, constant answer, but with the fx changing its timbre everytime.
However, I already had the call and response built into the “clean” piano improv, and I liked it when the processed piano echoed, so that’s what I went with.
The answering pianos are pitch-shifted with a bit of delay. The lower one makes use of Ableton’s Beat Repeat.
The “clean” piano has a two versions of a vocoder on it that show up in the last half of the track. One is a pitch-tracker, which provides a kind of fretless bass sound. The other is white noise, also with a delay, to provide a bit of white-wash percussion.
I love Pierre Schaeffer’s “Duex Aspects de Piano,” and I think that influenced this piece in spirit.