I am new to PD, doing audio experiments for now and may build a performance synth some day. I thought I would post this abstract for feedback because it does a few unusual things, and I'm sure there are things I'm doing wrong. It's supposed to mimic piano key hammers, but it can also make drum like envelopes if release is shorter than decay:
Also, how slow is fexpr~? I was thinking I could implement an audio rate version of "integrator", but not if it's too expensive, I plan to add polyphony next.