In modular synthesis, a “ping” input is a place where you can patch a trigger or gate of any duration, and it converts it into a simple envelope. In particular, some filters and low pass gates (LPGs) have Ping inputs that create an instant attack and fairly quick decay to form a percussive-style envelope, internally patched the the filter’s cutoff frequency. If the filter is oscillating due to high resonance, this creates simple analog percussion sounds such as classic drum machine kicks.
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