Hi, at the moment, there are more particles the longer the note is held down. As far as I can tell, this is the only factor for this effect- so a long held chord makes the most spectacular visual effect with these particles.
However, I'm finding that for the majority of the time, musically it's the short sharp notes that need to create the strongest visual effect, not the long held notes. Could you create a choice to reverse the current settings so that you get more particles the shorter the note?
Also, it would be really amazing (and incredibly logical) if there was a choice to have more particles with loud notes, and less particles with more quiet notes.