Modulator Intensity/Depth in FAUST, best practice?

[Morphoice]

This happens a lot and I always get this wrong.

What is the best way to modulate a signal with e.g. a velocity dependent on a velocity-modulator intensity?

signal is obviously -1 to +1 or any value
modulator can be 0-1 (e.g. a velocity) or -1 to +1 (e.g. an lfo) (so I guess it's two seperate formulas)
and the intensity is 0-1 where with 0 the signal remains unchanged and with 1 it is modulated by the velocity.

what are the most simple formulas for this?
I reckon many people often need this and can't wrap their head around it.

I have figured this out many times before but whenever I look at it or try to reuse it on another occasion it somehow turns to mush by just looking at it... and a dry/wet node can't be the most optimal solution

[Morphoice]

I figured out the following so far

velocity = 1-depth*(1-gain); // for modulation from 0-1
process = osc(freq) * velocity <: _,_;

this gives me a velocity according to the depth from gain (the midi velocity automatically captured in faust). So if depth is 1 there is full velocity modulation, if depth is 0 the notes are always maximum volume (velocity = 1)

similarly with signals from -1 to 1 this should work

modulation = 1-depth*(signal*0.5+0.5); // for modulation from -1 to +1
process = osc(freq) * modulation <: _,_;

someone please correct me if I'm wrong. This still looks like mush to me but it seems to work and I can't see an easier way to do it.

[sletz]

@Morphoice the first 1* part is just useless right ? (also Faust will optimise this itself of course)

[Morphoice]

@sletz fixed thanks