1-2) In fixed point mode, each sample is a 32 bits integer
In floating point mode, each sample is a float.
Check MPC_FIXED_POINT and MPC_SAMPLE_FORMAT in math.h
3) You need to convert it before using it. It allows more flexibility because you can, for example, convert it easily to 16 or 24 bits. Check the function WriteSamples() in sample.cpp for a working example.
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