Update ampeg_dynamic.md

Correction as to when the non-dynamic behavior allows recalculation of durations.

opcodes/ampeg_dynamic.md

@@ -4,7 +4,7 @@ opcode_name: "ampeg_dynamic"
 ---
 When 1, causes envelope durations to be recalculated when a MIDI CC message
 modulating those envelopes is received. When 0, envelope durations are
-calculated only at the start of the note.
+calculated only at the start of the particular envelope segment.
 
 ## Examples