mr average
Banned
I think the potential issue at hand is that some Dolby NR schemes are based on companding different frequency bands. So, if you encode something at one speed and attempt to decode it at another speed, with everything shifted an octave up or down, it's liable to end up in a different filter circuit than was intended.
I'm not sure if Dolby C or S work that way, though - 'C' is supposed to be based around two 'B' decoders, but whether they're in series, or parallel with different frequency bands I have no clue. Obviously if this is B or DBX encoded it's kind of moot anyway because they have a single band anyhow. In any case, the effects can't be that bad or you wouldn't have varispeed controls on the decks.
he would have to somehow remove the dolby after the tape was recreated at the correct speed
if there is a plug in for that dolby then he could do it after fixing the speed in the daw without a big problem
hopefully he gets a used deck that is the same and he wont have to worry about all the stuff we discussed