Using expressions to create stepped graph

[Jt Pase]

Thank you very much for your help on my problem. Luckily in the end, my client just decided to go for a more accurate visualization so I ended up using audio beam which is much simpler. I’ve attached a frame of what I ended up.

I haven’t solved the problem of using particular, I would actually think that since the particle has been already emitted, changing the amp or frequency parameter should only change future particles so I didn’t expect the weird behavior I got.

In any case, that’s a bridge I shall cross if I have to do something similar in the future. Thanks very much for your time and help on this, it’s much appreciated!