Based on info here:
	https://groups.google.com/forum/#!searchin/comp.sys.apple2/qkumba$20audio/comp.sys.apple2/Fx2SkEWuXAE/aCS8ie20GQAJ

Get wav file.
Use audacity to convert to a mono 33kHz wave.

Load into BtC converter via wine, write out 1-bit btc file.