Audacity Forum

I have kept each step separate as opposed to combing them, still feeling a bit fragile. No problem. The first task is to get something that works. It can be tidied up later :D --- Note that (setf track-name (get '*TRACK* 'NAME)) will only work with "normal" effects (;type generate, proces...

For Effect / Analyze / Generate type plug-ins, we are usually saved from having to extract data from GetInfo. The reasons that we have to do this the hard way are: 1. We want to get data about the entire project, irrespective of the current selection. 2. Nyquist cannot directly read label tracks. 3....

Manipulating audio is Nyquist's forte. That's what it was designed for. Parsing lists of data is a bit cumbersome, but at least we don't have to parse the raw string data from "GetInfo:". Manipulating strings (text) in Nyquist is painful :D If you're interested in how AUD-GET-INFO works, i...

Recapping on my previous post, we have seen that we can get a list of labels for each label track with: ;type tool (setf info (aud-get-info "Labels")) ;; DOLIST is a convenient way to iterate through lists (dolist (one-label-track info) (print (second one-label-track))) We are probably mak...

Moving on to Label tracks. As previously described, (aud-do "GetInfo: Type=Labels Format=LISP") will get us the information, but only as a text description. We will use AUD-GET-INFO instead as that gives us a LISP expression which is much easier to work with. We will also run these example...

insch wrote: ↑

Thu May 27, 2021 10:26 am

How do you advise that I change the sample rate of the recording?

To achieve the required "stretching", you just need to change the "Track Rate":

steve wrote: ↑

Wed May 26, 2021 9:10 pm

An even quicker / easier way would be to simply change the track sample rate. (See: Rate)

(Click the link "Rate")

I'm stuck on extracting the start and end times of the labels. Tried "dolist" and "dotimes" but I still don't fully understand the mechanics of those two. All credit to you for having a go :) Yes, it's a bit tricky. Firstly, the difference between (aud-do "GetInfo: ..."...

Thanks for the clear steps.

I'm currently on a Linux machine. The issue does not happen here.

@ Koz can you reproduce it on your Mac?

Try updating to Audacity 3.0.2.
I think that's unlikely to be the problem, but 3.0.2 does fix a number of issues.

"Change Pitch" retains the original time base. That is, 1 minute of recording time will play in 1 minute. The downside is that the sound will be distorted quite a lot with a big shift in pitch. "Change Speed" retains the exact waveforms, so the sound quality is near perfect but l...