diff --git a/dsp/main.c b/dsp/main.c
index a4b9003..8bd4e1b 100644
--- a/dsp/main.c
+++ b/dsp/main.c
@@ -2,7 +2,7 @@
 
 void init() {
   square0->output_address = pdmout0;
-  square0->high_val = 0xffff;
+  square0->high_val = 0x6fff;
   square0->low_val = 0x0000;
   square0->flags = SQUARE_FLAG_ENABLE_msk;
   // will set the period later