When i look FCC ID codes i found unknown hardware interesting for me.
Forte Technologies Inc (creator of the VFX1 headset and co-cretor of GF1/Ultrasound) list these products:

https://fccid.io/H55
H5510200 1995-07-19 Game Controller
H55SC-208-1 1991-08-06 Midi Interface and Stereo Audio Card
H55MC-108-1 1991-07-30 Midi Interface and Audio Card
H55AUDIOFX-2 1989-10-20 Sound Effects Board
( H5510100 1995-07-19 Virtual Reality Headset w/Interface Card) - known product

I can´t find any information about Forte Game, Sound and MIDI products. Have someone any info?
What is Forte AUDIOFX-2?

I know AudioFX is name of soundcard from ATI but it was from 1991, not 1989.