[LAD] Faust "pitched envelope"

[Yassin Philip]

Hello everyone

The idea is to rapidly rise, and (a bit slower) fall, the pitch of a
percussive sound
<https://modeaudio.com/magazine/drum-synth-sound-design-kick-snare>, so
this pitch has to evolve over time..? Googling for it is a bit tricky,
and I can't find any recipe anywhere

Also, is is possible to assign the parameter value of a Faust function's
to the output of another? To, for instance, lower or rise an eQ band
frequency with the output of a compressor?

If it is, I'd really like to learn how for now, I only know how to set
parameters to static and/or user-defined values.

yPhil