diff --git a/applecorn.po b/applecorn.po
index 035d7f5..5e484fb 100644
Binary files a/applecorn.po and b/applecorn.po differ
diff --git a/mainmem.audio.s b/mainmem.audio.s
index 20f09d5..141de33 100644
--- a/mainmem.audio.s
+++ b/mainmem.audio.s
@@ -516,9 +516,11 @@ PITCHENV    LDA   CHANENV,X                 ; Set envelope number
 * Update pitch value. Called by PITCHENV.
 * On entry: A - Change of pitch/step, X is audio channel #
 * X is preserved
-UPDPITCH    CLC
+UPDPITCH    STX   OSCNUM
+            CLC
             ADC   CURRPITCH,X               ; Add change to current
             STA   CURRPITCH,X               ; Update
+            TAY
             JSR   ENSQFREQ                  ; Update Ensoniq regs
             RTS