diff --git a/menorah_03.c b/menorah_03.c
index 9404612..8a668ed 100644
--- a/menorah_03.c
+++ b/menorah_03.c
@@ -353,7 +353,7 @@ void tune_playnote (byte chan, byte note) {
     if (chan < NUM_CHANS) {
         if (note>MAX_NOTE) note=MAX_NOTE;
         decrement[chan] = pgm_read_dword(decrement_PGM + note);
-        accumulator[chan] = ACCUM_RESTART;
+        accumulator[chan] += ACCUM_RESTART; // changed from '=' to '+=' for better frequency accuracy
         playing[chan]=true;
     }
 }