Rob - you are working way too hard to determine the sox output device.
Just do -d instead of -t alsa and it will pick the output device
automatically.
I would structure it like this:
If nothing is passed to -b then use -d in sox, and -o is ignored.
If an option is passed to -b then use it, and if -o has an option then add
it as well.
Make a note in the man page that -o requires -b and error if -o is used
without -b.
I wonder if this message will reach you considering the bug is from 3
years ago.
I could probably fix up this patch myself if you like.
-Ariel
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