Combining fluid.ampslice~ / fluid.ampgate~

[rodrigo.constanzo]

@rodrigo.constanzo

Also, turns out that threshold~ would be perfect on its own, as it has built-in time hysteresis, but it outputs message rate, which makes it useless for this purpose.

For the time being I’m doing this, and it’s working pretty well:

Not ideal, but the ADSR~ I have further downstream is triggered via message rate anyways, so just driving it with a parallel fluid.ampfeature~.