diff --git a/const.h b/const.h
new file mode 100644
index 0000000..f5e015b
--- /dev/null
+++ b/const.h
@@ -0,0 +1,15 @@
+#pragma once
+
+#define MUX_S0 2
+#define MUX_S1 3
+#define MUX_S2 4
+
+#define MUX0 26
+#define MUX1 27
+
+#define VCO_BUTTON 6
+#define QUANT_BUTTON 7
+#define AMEN_BUTTON 8
+
+#define AUDIO_OUTPUT 0
+#define STATUS_LED 1
\ No newline at end of file