Slow PCM Audio

[agg23]

PCM audio in titles such as Galactic Pinball are too slow.

[agg23]

Galactic Pinball PCM is driven by the timer. Setting the timer to 350 cycles per 20 us, as opposed to the expected 400 cycles, seems to match my hardware playback.

[agg23]

• Setting all CPU instructions to take 1 cycle did not speed up PCM playback. Setting all instructions to 100 cycles slowed down normal audio and PCM playback.
• Speeding up VIP 2, 3, 4x results in animations being faster, but no change to PCM playback (though the whole audio playback got stuttery at 4x).