you can make 2 or more versions of the chordtrack. click the little arrow for ‘duplicate version’ or ‘new version’. But there can only be one active chordprogression.
It depends very much on the audio source. The more complicated the source material is (with regards to sounds, rhythm etc), the worse the detection gets. So simple piano block chords or strummed guitar work quite well, but arpeggiated synth lines for example will be difficult. If you have audio tracks that don’t have the full chord information at a given time, e.g. only two notes of a triad chord, the result will be understandably bad. In that case, maybe it could work to mix down two or three audio tracks that in sum contain enough notes to one stereo track and then drag that on the chord track.