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What precision do you need??? Musically a mSec is nothing to care about. If you want to mix the loopback with the original signal, you’d need to delay the original in terms of samples not msec to avoid comb filtering. The specified 1.2mSec and delay adjustments in tenths of a msec are both way too coarse. And since we’re going through analog you’d also need to take into account the internal processing of the DAC and ADC as well…
If you’re worried on a sub-mSec level, just don’t make external loops. Otherwise just ensure the delayed signal never meets the original and you’re fine.
Just a question of interest: Did you ever do analog mixing and also worried about the delays within your sidechain FX?