Hello! I used to do a lot of ambient guitar looping with Rack, and will probably do a lot more. There are loads of options, but the first point is you can record/loop CV in exactly the same way as audio. CV and audio are largely interchangeable, so if you want to play synth parts live and record the notes instead of the audio, that’s possible. I mainly work with audio and either use Nysthi Simpliciter, or the Luppolo looper:
VCV Library - Sonus Dept. Luppolo3 - you can trigger this to record in time, just use a clock divider into the trigger (/4 for one bar, /16 for 4 bars etc).
I have to say the search function isn’t ideal in the library, searching for the word ‘looper’ produces 829 result, most of which are not loopers. Having been into this for a while, I know a few modules that can definitely be used for audio looping:
VCV Library - Ahornberg Tape Recorder - this emulates more of an anaolgue tape recording process, but can loop too.
VCV Library - NYSTHI ClockableDelay - this has something like 10 seconds delay time, and the hold function loops the same way as Chronoblob. You can also toggle reverse playback, which is fun.
VCV Library - Lilac Looper - I haven’t used this much but works well from what I’ve read.
The new Prince of Perception module is worth a look, and if you are prepared to pay for commercial modules Path Set has a few granular looping modules, including the new ones developed with Omri Cohen.
I usually share patches, and most of the pieces in my ‘modular guitar effects’ thread have a looper section somewhere:
Those patches tend to be fairly complex, but if you want a simpler looping patch knocking together let me know.
Cheers