[GreenKeys] Digitech test set

[Jim Haynes]

I have a couple of test sets made by Digitec Data Industries, appear to
be test message generators with ability to generated distorted signals.
One has no output and the other puts out signals of dubious quality.
These are portable units containing several modules; and I have seen
pictures of rack-mount equipment using some of the same modules.

Has anybody ever heard of these, or might have access to a manual, or
wants them to play with?