SPU: Kind of revert last ADMA change. Clear as reading.

This is a temporary measure while we run some hardware tests, the previous change broke Burnout 3's engine sounds.

pcsx2/SPU2/ReadInput.cpp

@@ -111,11 +111,17 @@ StereoOut32 V_Core::ReadInput()
 			SetIrqCall(i);
 
 	// PlayMode & 2 is Bypass Mode, so it doesn't go through the SPU
-	if ((AutoDMACtrl & (Index + 1)) && !(Index == 0 && (PlayMode & 2) != 0))
+	if ((Index == 1) || !(Index == 0 && (PlayMode & 2) != 0))
 	{
 		retval = StereoOut32(
 			(s32)(*GetMemPtr(0x2000 + (Index << 10) + ReadIndex)),
 			(s32)(*GetMemPtr(0x2200 + (Index << 10) + ReadIndex)));
+
+		// Not accurate behaviour but shouldn't hurt for now, need to run some tests
+		// to see why Prince of Persia Warrior Within buzzes when going in to the map
+		// since it starts an ADMA of music, then kills ADMA, so it loops on a few ms of data.
+		GetMemPtr(0x2000 + (Index << 10) + ReadIndex)[0] = 0;
+		GetMemPtr(0x2200 + (Index << 10) + ReadIndex)[0] = 0;
 	}
 
 #ifdef PCSX2_DEVBUILD