1 files changed, 4 insertions, 1 deletions

diff --git a/firmware/mpeg.c b/firmware/mpeg.c
index 1b9cd828c2..969652d259 100644
--- a/firmware/mpeg.c
+++ b/firmware/mpeg.c
@@ -1795,8 +1795,11 @@ void mpeg_set_pitch(int percent)
 {
     unsigned long val;
 
+    /* invert percent value */
+    percent = 10000/percent;
+
     /* Calculate the new (bogus) frequency */
-    val = 18432 - (18432*percent/100);
+    val = 18432*percent/100;
     
     mas_writemem(MAS_BANK_D0,0x7f3,&val,1);