Fixes/Improvements
- (SNES) Fixed a bug that caused the APU's echo filter to stop processing while the amplifier was muted; this fixes random freezes and audio glitches in Donkey Kong Country 2
- Freezes could occur because if the echo buffer hadn't wrapped around by the time the game re-enabled echo buffer writes after reducing the echo buffer size, the echo filter could overwrite part of the SPC700 program and cause the game to lock up the next time the main CPU tried to handshake with the APU
- (SNES) Added a new option (on by default) to slightly increase the APU's master clock frequency, which when combined with audio sync has the emulator run at 60 FPS instead of ~60.098 FPS (NTSC)
- The ~60.098 FPS speed is more accurate to actual hardware, but it can cause audio skipping and/or framerate stuttering depending on display characteristics and VSync mode