Fix timing of music on the title screen.

This fixes #24 (thanks @NY00123).

NEWS.md

@@ -20,6 +20,7 @@
 * An input bug was fixed where a backspace would leave some visual
   corruption, and the cursor now blinks.
 * A bug was fixed where the same medal could be awarded twice.
+* Timing of music on the title screen was fixed (thanks @NY00123).
 
 # v 2.3.0 (2023-05-20)
 

src/swsound.c

@@ -607,7 +607,7 @@ void swsndupdate(void)
 	int thisclock = Timer_GetMS();
 
 	if (thisclock > lastclock + 1000 / 18.2) {
-		lastclock = thisclock;
+		lastclock += 1000 / 18.2;
 		soundadj();
 	}
 }