[linux-audio-user] Time/pitch shifting software?

[iain duncan]

Ok, last question this morning. ;)

Subjective opinions on which linux time/pitch shifting utility is the
most usable for changing keys and tempo of music ( no voices )? Does not
need to be "production quality" but good enough to shift backing tracks
and still be able to use them. Able to run on OSX as well under fink
would be a bonus!

Thanks
Iain