What an idiot: I used a wrong routing to record the variations
here is the correct routing
with Scaler 1 active (yellow button) feeding chords, 5 MIDI active (yellow button) feeding variations, and all other tracks not armed/active
And here is the result
I love a lot this way of feeding AAS Strum-GS 2 with chords and arpeggios in Guitar mode, but I sometimes forget to change the routing before recording