Update egN_dynamic.md

Clarifying default behavior.

opcodes/egN_dynamic.md

@@ -2,7 +2,7 @@
 layout: "sfz/opcode"
 opcode_name: "egN_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 particular envelope segment.
 ## Examples
 
 ```
@@ -17,5 +17,5 @@ eg1_time2=4     // ..with a release time of 4 seconds
 
 eg1_time2_oncc1=-8  // assign modwheel to modulate release time
 
-eg1_dynamic=1   // 1 = modulation will affect all notes immediately, or 0 (default) = new notes only
+eg1_dynamic=1   // 1 = modulation will affect all notes immediately, or 0 (default) = new segments only
 ```