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This mixer type was added in 943b4c2036002454b276e0190dfc2c8919fb0cbf because "anything which produces sampled data with high latency (like the MT-32 emulator) will sound terribly", but as far as I can see (or reproduce), this mixer doesn't do anything that would solve that problem, except that it effectively doubles the size of the audio buffer so there's less chance of an underflow due to slower-than-realtime synthesis by the softsynth. But you don't need the overhead of a separate thread to do that, you just need to increase the buffer size.