Hello Rusty!
In principle you don't need ALSA or JACK to perform off-line processing. But
it always depends on the particular application in question. Ecasound and sox
can do that. Nama could as well, but it would probably need an option to
simluate either audio device, because there's always the master output
connected to a live system.
Warm regards
Julien
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Music, creative writing, technical information:
http://juliencoder.de/
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