Ok, I feel strange asking this. I never thought I was going to publish such a basic question… How can I do a BASIC linear sweep from, lets say, 100hz to 200hz? I usually do it by fading the two frequencies at w multiphase LFO at 180°. Anyhow, the amplitude, I just noticed, is not constant, and I need constant amplitude for the frequency spectrum studies I’m currently ongoing.
Thanks 
running a single LFO into the frequency input of a VCO is the trivial way to do this.
Yup. CHIRP has the advantage of being able to dial in (or type in, or input CVs) the start and ending frequencies (low to high, or high to low), the time from start to end, and to choose either a one-shot or looped sweep.
But … you can only get a sine wave out of it.
For some kinds of analysis you want an exponentially swept sin. I’ll bet Chirp is used in the Ranalyzer. Definitely if you want a precise sweep, Chirp would be a good way to go. I think I used an exponentially swept sine in some of my unit tests to check the response of a gizmo.
This is great.
Thank you