I have uploaded a list of demo tape collections (cassettes) that were produced when FORM@ RECORDS was called FORM@ Label. I found quite a few sample sound sources, so I uploaded them. Although it is a SoundCloud site, it can only be played from the FORM@ RECORDS site.
VIRGO's "Knossos" that can only be heard here. My personal favorite is VIRGO's alias Minerva's "canticle". You can see that many of the tracks recorded in the FORM@ RECORDS compilation "ART FORM 1" are also from the cassette era. It hasn't been mixed down yet, and the sound isn't good because it's a sound source copied from a cassette tape.