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Another problem with autocrossfading in Nuendo is that there is no direct access to the autocrossfade length during record sessions.
On digital audio tapes machines there was a pot on the remote to set the length so that it was possible to change it depending on the instrument you were punching in/out.
You can see this here on a Sony 3348 digital tape machine remote, in the right upside corner there is a pot to set crossfade length.
Cross fade time is adjustable in 16 steps over the range of from approximately 1 to 370 milliseconds :