Update ampeg_dynamic.md

Author: DSmolken

docs/opcodes/ampeg_dynamic.md

@@ -4,6 +4,8 @@ opcode_name: "ampeg_dynamic"
 ---
 When 1, causes envelope segment durations and sustain level to be recalculated when a MIDI CC message modulating those envelopes is received. When 0, envelope segment durations and sustain level are calculated only at the start of the particular envelope segment.
 
+One use of this is piano half-pedaling.
+
 ## Examples
 
 ```sfz