Converts an ST format sound (8-bit unsigned samples) to Hippo/Navarone format
sound (8-bit signed samples).

usage: st2hippo stformat.snd hippo.snd sample-rate

Specify sample-rate in Hertz (samples per second); e.g.,

	st2hippo stformat.snd hippo.snd 11000

Conversion can be done in place; i.e., source and destination file names
can be the same.

Dave Baggett
July 24, 1991