Hi. I’ve often liked to play something and while playing a melody, adjust the sample loop length. It’s just really nice. How would I go about recording this to a new sample?
The most simple is to use voxengo recorder (vst) on the track you’re at, then loading the wav.
Well, a setting (but with sample recorder monitoring OFF, of course) like this worked:
In Device: Soundflower (2ch)
Out Device Soundfower (2ch)…
Now if only those could be called on-will and then returned back to prev. in device out device settings
put this vst on the master channel:
But ahm on osx!
you’re doomed! 
The soundflower(2ch) to soundflower(2ch) is pretty okay as a solution, but would be nice to do it directly in Renoise 
Not what you want, but:
…do it oldschool style, record to tape! Seriously though, I’ve recently been playing my material through different speakers in different room sizes and field recording them through a microphone (zoom h2), than mixfade the fieldrecordings with the original material to shift in contexts over time. You can get pretty nice results with it!