The resident time shift tool in Audacity works fine, letting me speed up and slow down recorded instrumentals, without altering the pitch. But the tool requires much time to edit poor timing, having to highlight the waveform, section by section then try different settings.
Is there a plug-in available to simplify such a process, something like a graphic line that can be mouse-dragged up and down to speed up or slow down the tempo, without changing the pitch?