It's regarding Polyphony, from Cycling74.
At that mark in the video, it introduces a better way to manage MIDI input with a float, edge~, and swap.
To my understanding the [mtof] sends a float to the right input of [float]. [float] holds it until [edge~] makes it output the value with a bang. [edge~] just receives 0 or non-0 signals. Then there's a swap that deals with the [mtof] before sending out velocity.
Do I have that correct?
My other question is, what's wrong doing it without [edge~], [float], and [swap]? I may have an idea but I'd like to hear someone's opinion on how this improves performance?