thanks
I add some insight
I tested a basic preset, bossanova 4, and found that green keys work perfectly when you record nothing: simply tapping chord keys with my left hand and fiddling green keys with my right hand works and there is no conflict between chord sound and solo sound as I mentioned here
the problems raise when I record something, even a few chords of bossanova 4, then I mute chords and try to do the solo: sometimes it works, sometimes not, and in the latter case I can only close the Ableton project and restart the whole
I also noticed that when a line (A or C) is binded, and Scaler is in synchro with the DAW, when I push the space bar to start the song, the chords top bars (red lines in my screen-shot) flashes one after the other untill the end of the cycle is reached, then those flashes stop
I noticed that this cycle of flashes is the sign that green keys can be used
I also noticed that sometimes the DAW is not in synchro, even if I set it as default
I don’t know why the default option is overridden, but I have a suspect: maybe one of the keys of the chord/pattern conflicts with a shortcut, as e.g the key that mute/unmute the output?
about the Scaler case I uploaded, the chords top bars don’t flash anymore
unfortunately I don’t remember if yesterday night they flashed but it is plausible they did
that’s all for now, I have to nap