Same here, I can't bear to part with the Darth Vader of modems.
HST training sequence was the best sounding. Would love to hear that again, and see a breakdown of what was going on there. Probably not as easy as maybe it's a trade secret vs. published standard. Also the stealth fighter of modems if you remember the print ads for it.
I was still using mine for the answerphone capability (it was a "voice" modem variant) until the end of last year; but now I have no analogue phone service, only VOIP...