This is the only thing of its kind that I've found so far,
which actually works. And it works well.
My current interface to it is a bunch of shell scripts
called "record", "mix-two-tracks", etc.
I see that there are several GUIs out there but none
that are really good. (Maybe if there was a really good
one, there wouldn't be any others.)
What would be nice is a tool with a threshold gate that
triggers recording (or maybe there is one??)
And maybe something like a "circular file" which emulates a tape on which you can record at most
n seconds of new material, after which the material
at the start of the loop is overwritten. Actually it would
be nice if ext2fs supported this sort of file. Would be
nice for logs too. Hm, maybe I'll write one..