Bought the unit in 2020, the reviews were exciting... The reality is that it can't handle even harmonic minor, only natural minor (which I don't use at all). If I do any key change on a guitar, like playing G C Am G F# -> E7!! Am F C G C -> G, the unit gets crazy, it even doesn't stop its "harmonies" when it can't offer any of the ones it "is aware of". It pretends I sing 1 semitone out of tune, the guitar is temporarily out of tune as well, but the Unit is right with its harmonies. Last week I had some time and opened the box where I put the unit back 5 years ago just to see if I'm missing something. No. It's by design. I found a chart on the Internet where it's clear that the unit isn't able to harmonize C# and G# notes in key of Am. In the table there's a dash (no harmony). So if there's a A7 or E7 chord in Am key, the unit will play harmony for the closest note it has in its table, for instance, when I sing g# over E7 guitar chord, it generates something totally out of tune so that I can't even continue to sing my part. Will try to sell it, maybe someone will benefit from singing some simple songs along with it, like "Music is my fashion" that's used as a demo.
From A technical side, there's no option to send the generated back vx to a separate XLR out (because there's just single one!) and main vx to another one. When recording or even on stage where there's a sound engineer on a mixing desk who can at least turn volume off for back vx if the unit gets weird, this feature could be essential.
