Emulator

Fixing the title

<delroth> btw, if my fix makes it into a progress report somehow, here is how I fixed the audio:
<delroth> - since it started well and just started breaking after some time, I looked at the input data being read by the DSP
<delroth> - input samples seemed garbled too, so I looked at the addresses it was being read from
<delroth> - rs2 is using looping sound for streams (which is common), but when the loop point was reached, the end point of the voice wasn't reset, causing it to read out of bounds at some point
<delroth> - I compared with addresses on LLE and confirmed that on LLE the end point was being changed when the loop point was reached
<delroth> - I looked at the accelerator overflow exception handler in the AX UCode (which is called when the accelerator reaches its end address and loops back) and noticed this LR/INC/SR thing which wasn't implemented in AXVoice.h
<delroth> so it's one of these fixes that are trivial when you have context around how audio emulation works on gc.

the Low Pass Filter code is currently broken in HLE audio right now.

// TODO: LPF code is currently broken, causing Super Monkey Ball sound
// corruption. Disabled until someone figures out what is wrong with it.
if (0 && pb.lpf.enabled)
{
pb.lpf.yn1 = LowPassFilter(samples, count, pb.lpf.yn1, pb.lpf.a0, pb.lpf.b0);
}
// Mix LRS, AUXA and AUXB depending on mixer_control
// TODO: Handle DPL2 on AUXB.

It has nothing to do with LPF.

A word of warning that this also affected Star Wars Rogue Squadron III: Rebel Strike (GLRE64) in 5.0 (although 5.0 has a gameini that uses LLE audio for both Rogue Squadron 2 and Rogue Squadron 3, so this only happens if you modify the gameini).