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Cleaning up synthesis filter and using new FIR filter with buffer.
Adding a FIR filter implemented with its own internal buffer. This one keeps its own delay line and just takes in input samples instead of a pointer to an external buffer.
The synthesis filter is being updated to use the new FIR implementation.
Can now set more channels than input signals. Empty channels are established as the outtermost channels (around fs/2 and -fs/2).
Fixing ordering so that the input channels line up in the output signal properly.
Adding the synthesis filterbank (the opposite of the channelizer). It's ugly right now and uses a lot of memory to handle the buffers for each filter/input stream.
