diff --git a/dispatcher.h b/dispatcher.h
index f336c09..8611388 100644
--- a/dispatcher.h
+++ b/dispatcher.h
@@ -15,6 +15,8 @@
 #define MAX_SCENES 8
 #define MAX_CHANNELS 8
 #define MAX_CLIPS 512  // 8 grids * 8 scenes * 8 channels
+#define GRID_ROWS MAX_SCENES
+#define GRID_COLS MAX_CHANNELS
 #define MAX_BUFFER_SIZE 441000  // 10 seconds at 44.1kHz
 #define MAX_UNDO_HISTORY 256