Roger Mayer HFX Aural Exciter , any infos?

[richiyobs]

https://reverb.com/item/54935818-vi...el-hfx-genesis-the-farm-studio-owned-with-coa
is it possible to get any extra infos or schemos about this rare and limited produced unit?
as declared in the link , only 15 units were made...

could it be something similar to RM68 gate?

thanks for your attention

best