diff --git a/cubesatsim/cubesatsim.ino b/cubesatsim/cubesatsim.ino
index a02b1439..f8e4c2a3 100644
--- a/cubesatsim/cubesatsim.ino
+++ b/cubesatsim/cubesatsim.ino
@@ -2021,7 +2021,7 @@ void pwm_interrupt_handler() {
     if (wav_position < (WAV_DATA_LENGTH<<3) - 1) { 
         // set pwm level 
         // allow the pwm value to repeat for 8 cycles this is >>3 
-        pwm_set_gpio_level(AUDIO_OUT_PIN, WAV_DATA[wav_position>>3]);  
+        pwm_set_gpio_level(AUDIO_OUT_PIN, buffer[wav_position>>3]);  
         wav_position++;
     } else {
         // reset to start