All my hardware comes into AUM on an iPad on discrete channels for fxs, busing/mixing, and recording (as much as possible, at least…4 stereo tracks for the Digitone Keys really makes me wish I had 8 mono outputs on the Digitakt and/or that over bridge worked via iOS…); on my Digitakt input channel I have a send that goes to my resampling channel with EQ/Saturation/etc, and that (either summed to mono or one channel or the other) gets sent back into the 2nd Digitakt input (the other either is fed by a different channel or other hardware/fx/whatever); when I need to tweak a sample in the DT I bus it through that send, monitor where I normally do in AUM, and with that input’s monitoring off, snag the effected version and use that, keeping or deleting the original as necessary.
Personally, I often have to avoid even this method since I sample a lot of original loops from various iPad Apps to slice and resequence on the Takt, and live resampling doesn’t work to get precise 16 or 64 beat long recordings which is required for my auto-slicing template sequences to work properly. For that, I resample in AUM, trim in AudioShare, Airdrop to my iMac, just to transfer the new loop as data to the Digitakt via USB, forcing me to slave it via 5pin to the Digitone, which leaves slaving the iPad via Digitone’s USB. It’s a digital birds nest and while it only takes a minute, it’s pretty annoying considering literally the only music related thing I use my desktop for these days is to transfer loops from my iPad through the air to the Digitakt through a cable. I really wish an iOS app (that worked, there is one abandoned one on the App Store) supported transferring files to the Digitakt. Not to mention core audio functionality.
But yeah, pretty much gotta either sculpt through something when you sample, or resample it sculpted via round trip, or transfer/record to elsewhere for processing and still resample or transfer it yet again. That’s why I like the instant FX loop option if you’ve got a send or hardware processor available to dedicate to the task. If you’re good with destructively sculpting things ahead of time and know what it needs, far easier to just put it inline before it hits the Takt’s inputs. Luckily for me, my Digitakt’s always already wired into an output of the iPad since everything goes through or comes from there anyway as it’s my mixer/recorder.