1. Fix Wii Speak SAMPLER_MUTE register:
The register should be 12 (i.e. 0x0c) instead of 0xc0.
2. Fix Wii Speak buffer memcpy size parameter:
It seems to fix random echoes and reduce noises when nobody is speaking.
3. Change the isochronous transfer timing:
It is based on empirical testing.
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