Hi, i'm building a kick-drum synth and I'm struggling with getting the ADSR right. From what i've understood it's easiest to use an array to draw the audio level/pitch level curve and have it read each time I press a button to play the kick. I want to be able to use one vslider to change the function in the array, updating it simultaneously and generating a nice mathematical curve for my kick. How is this easiest achieved?

Thanks in advance

If you wanted to do this, you could use [until] and hook it up to a counter to generate 0-n numbers, and then feed it into your formula, like this:

[until]
l
[f] x [+ 1]
l
[my formula]

But I wouldn't really recommend doing this if you want to control the parameters in real time. The formula will update every point each time it receives a new value, which is very inefficient and will possibly lead to audio clicks.

A better solution is to generate the envelope in real time with line level objects. [vline~] will give simple linear output; you can square it if you want a curve. You can pack all the variables you want into a list and then send them to the object each time you want to generate a beat.

If you want exponential curves, I posted a way of doing this here: http://forum.pdpatchrepo.info/topic/10336/exponential-adsr-envelope-using-lp-filter

can't you use line~ and tabread~ to read data from an array if you want to have a fast, complex envelope?

but I agree, for a kick drum a couple of line~ objects or a line~ multiplied by itself usually does the job.

I often use 2 line~ objects: 1 for a very steep short fast decay on the transient and then a slower one for the longer decay. so you get a click at the front and then a slower tail.

thats great thanks!