I sent you a PM with the email for the fellow who does the C9 upgrades and
Oh yes, it was discussed back in the day about making holographic cassette tapes. I think that it might be discussed in the C-9 manual, but don't quote me on it. Anyway, Bob was saying that indeed the holographic process could be transferred to cassette, read most likely any audio recording device. If I remember one suggestion was about the possibility of listening to these tapes on car radio. Of course results would wildly vary but who doesn't like to have some fun with stereo?