diff --git a/src/samples/ghhb_game.h b/src/samples/ghhb_game.h
index 517246b..699d7f0 100644
--- a/src/samples/ghhb_game.h
+++ b/src/samples/ghhb_game.h
@@ -16,6 +16,7 @@ namespace
 {
 constexpr int LANE_COUNT = 12;
 constexpr int OCTAVE_COUNT = 3;
+constexpr int OCTAVE_OFFSET = 48;
 constexpr int MAX_GAMEPADS = 4;
 constexpr int MAX_INSTRUMENT_TYPES = MAX_GAMEPADS;
 constexpr float RECEPTOR_HEIGHT = 150.0f;
@@ -258,7 +259,10 @@ std::vector<Glyph> chart_from_song(const Song& song, int track_override)
         float time_sec = note.ticks / ticks_per_sec;  // This is now the BOTTOM time
         float duration_sec = note.duration_ticks / ticks_per_sec;
         int lane = note.midi % LANE_COUNT;
-        int octave = note.midi % (LANE_COUNT * OCTAVE_COUNT);
+        int offset = 0;
+        if (note.midi >= OCTAVE_OFFSET)
+            offset = OCTAVE_OFFSET;
+        int octave = (note.midi - offset) % (LANE_COUNT * OCTAVE_COUNT);
         int instrument_slot = note_index % MAX_INSTRUMENT_TYPES;
 
         // Log original glyph timing (time is bottom, time + duration is top)