If y'all will pardon my interruption, I'd like to share something interesting with you.
Disclaimer: I have no opinion whatsoever about Digidesign's Reel Tape Suite, so I don't know what they're doing or whether they're selling anything other than snake oil.
I work in the aerospace field. I know of past programs (long since "OBE" because of geopolitics) in which US companies built accurate replicas of Soviet surface-to-air missile radars. By "accurate replica" I mean a fully operational radar set that could set off the very sensitive and very selective radar warning receivers in Allied aircraft, and cause the RWRs to accurately identify the threat radar. These Soviet radar systems were all analog, tube-based systems with no solid state stuff in them and were dirty as hell, from a signal-purity point of view. (You can also imagine that they were a nightmare to maintain.)
You'd think that you would design a copy of a radar by starting with the same physical architecture and signal path of the radar set, and then tweak it so that the signals are indistinguishable.
You'd be wrong.
Here's how it was done, at least when digital signal processing technology became available. Signal gathering equipment would record the emissions from the Soviet radar sets by overflying them and getting their attention. Over and over again, in as many environments and scenarios as possible. This big pile of radar signature data was provided to a contractor. The contractor would reverse-engineer the signal signature in 100% solid state circuitry (except for the klystron transmitter, of course) and would introduce signal degradation digitally as necessary to replicate the analog Soviet signal. And guess what: with careful attention to detail, a digital radar system can actually fool a very expensive radar warning receiver into thinking it is receiving a signal from an old analog radar. Radar signals are much higher frequency than baseline audio frequencies, and I think it's safe to say that the composition of a radar signal from a nasty old Soviet analog radar was quite busy.
The moral of this story is that it is possible to replicate, at least to a specifically required level of accuracy, an analog signal with digital equipment, and it's been possible for years. It may not be cheap but it can be done. I'm also not suggesting that it can be done with a consumer sofware plug-in like Reel Tape Suite, but with smart enough engineers and a big fat contract, almost anything is possible!