diff --git a/plugin/ic1.cpp b/plugin/ic1.cpp
index 81f31bd..c945e43 100644
--- a/plugin/ic1.cpp
+++ b/plugin/ic1.cpp
@@ -1047,21 +1047,27 @@
 // 0767: 17 80       ORI     A,$80                      // OR with $80
 // 0769: 63 a2       STAW    $FFA2                      // store to Modwheel Amount
 // 076b: 4f 87       JRE     $06F4                      // setup 2-byte, return from interrupt
-// 076d: 71 a2 80    MVIW    $FFA2,$80
-// 0770: 4f 82       JRE     $06F4
-// 0772: 5d 4f       BIT     5,$FF4F
+// 076d: 71 a2 80    MVIW    $FFA2,$80                  // set modwheel amount to 0
+// 0770: 4f 82       JRE     $06F4                      // setup 2-byte, return from interrupt
+// 0772: 5d 4f       BIT     5,$FF4F                    
 // 0774: 4f 7e       JRE     $06F4
 // 0776: 4f c9       JRE     $0741
 // 0778: 74 7b 01    EQI     C,$01
 // 077b: 15 4f 02    ORIW    $FF4F,$02
 // 077e: 4f b4       JRE     $0734
+// -------------------------------------------------------------------
+// program change
+// -------------------------------------------------------------------
 // 0780: 55 a8 20    OFFIW   $FFA8_midiSwitch,$20 (MIDI Func1)
 // 0783: c5          JR      $0789
 // 0784: 0b          MOV     A,C
-// 0785: 17 80       ORI     A,$80
+// 0785: 17 80       ORI     A,$80                      // bit 7 might be used to indicate the patch needs changed
 // 0787: 63 a3       STAW    $FFA3
 // 0789: 71 3f 00    MVIW    $FF3F_midiByteCount,$00
 // 078c: 54 4c 06    JMP     $064C
+// -------------------------------------------------------------------
+// pitch bend
+// -------------------------------------------------------------------
 // 078f: 55 a8 20    OFFIW   $FFA8_midiSwitch,$20 (MIDI Func1)
 // 0792: d7          JR      $07AA
 // 0793: 0b          MOV     A,C