Ah right. The JIT has a +/- of 50ms jitter with spikes up to 500ms, so I wouldn’t trust it for fast/accurate loudness measurement.
Indeed, though that’s basically what the original patch in this thread is doing. So I’d be back to duplicating code with an envelope follower, or involving other frameworks (framelib).
I guess part of this post in general was just to see if “the loudness of an onset” (or change in magnitude for the spectral one) was on the radar for the fluid. stuff, as those seem like fairly common use cases that presently require work arounds to get at.