I have lots more from Spark that I would like to post, but it needs some sorting through, so here’s something of my own for now. This is an arpeggiated loop of a synthesized clavinet chord filtered in real-time with the cutoff frequency on the instrument, which happens to be the Korg MS2000. After looping it I ran it through some gentle amp modeling followed by two ping pong delays. One set very short and another set much slower. The short delay has a lot of feedback and almost sounds like reverb, while the long delay is creating the echo.
Appegiated Synth Clav