A Study in Pink

Programming and Development Nyquist
1

I found this code . it generates glissandi. On the other hand, it is very difficult to have a control of this code. I simplified It. I would want to ask beginner’s question.
The code is the following one:
(defmacro sweep (dur)
(stretch-abs 1 (mult (pwl 0 0.8 dur 0.05 dur)
(hzosc (sum 440 (mult 3360 (ramp dur)))))))

(defun lowpass (sig hz)
(resample
(force-srate (* hz 2) sig)(snd-srate sig)))

(abs-env
(sim
(s-rest 1) (s-rest 1)
(at-abs 15 (lowpass (sweep 4)840))))

Would it be possible to use this random effect hanging a few seconds of a sound? Let us imagine the following sinusoidal sound:
(abs-env
(scale 0.5
(osc (hz-to-step 697) 19)))

It would be possible, for example, to allocate to the sound these glissandis during 4 seconds. Of time t1 = 4s in time t2 = 8s for example. Before t1 and after t2, we would hear that the sound sisnusoïdal.
Beforehand thank you for the information.

2

Topic split.
Please do not add new questions on the end of unrelated topics.

I would have given your topic a relevant topic title, but I don’t understand what you are asking.

Also, please use code tags around any included code - it makes it easier to read and preserves the code layout.
If you click on the “Code” button (above the message composing box) it will insert [c_o_de][_/_code] at the cursor position.
Then type or paste the code between the two “code” tags like this:

[code];code goes here

[/code]

Also, when quoting code, please include a link to where it came from - it can be helpful if we can see the example in its original context.