Now fix repeating sequences

src/libsrc/apple/sndseq.pla

@@ -776,7 +776,6 @@ end
 // No sequence, just waste time and yield
 //
 def noSequence(yield, func)#0
-    return
     //
     // Start wasting time
     //
@@ -831,11 +830,17 @@ end
 // Play until keystroke
 //
 export def musicGetKey(yield, backgroundProc)#1
-    musicSequence(yield, backgroundProc)#0 // Call background proc every half second
-    if keypressed()
-        return getc
-    fin
-    return 0
+    char key
+
+    key = 0
+    repeat
+        musicSequence(yield, backgroundProc)#0 // Call background proc every half second
+        if keypressed()
+            key       = getc
+            seqRepeat = FALSE
+        fin
+    until not seqRepeat
+    return key
 end
 
 when MACHID & MACHID_MODEL