i have a unit made by marantz/super scope.
it doews not hove a bunch of mixing capability
or multiple tracks, but does have the advantage
of being portable (when used with the battery
pack) and not requiring electricity to plug in
to. I have used it to record sessions and jams
at festivals. The next model in the series has two inter-
esting features: It can speed up or slow down
the music in playback mode AND NOT CHANGE THE
PITCH, it can also change the pitch as much as
an octave above or below the krecorded note, and
NOT CHANGE THE SPEED. This can be a great tool for
learning a "riff" or modulating to a better key
top sing or play in...this one requires 110 v.
power, though.