I've been figuring out a workflow for mixing stereo recordings in Audacity from overdubbed tracks made with my looper pedal. Here's a couple of examples.
Basically I record a base track on the looper, and save it to computer. Then I overdub a track, and save _that_ to the computer. If more overdubs are wanted, the original base track can be copied back to the looper to serve as the 'framework' for the next overdub, and that result can again be copied to the computer. Then, the separate files consisting of base+overdub recordings can be dropped into Audacity, panned to their desired stereo positions and equalised or amplified, if needed, The final step is to reduce the strength of the base track by using the 'Remove centre' effect in Audacity, if desired. This may sound laborious but it's straightforward enough. The big advantage for me is -- no mics, good sound quality, and free software!
The instruments here are 3-5 tracks of my 3-string guitar, and 1 or 2 tracks of my 2-string bass.