I've been trying to do some tracing as well. I don't really think the circuit is a modded Octavia. The transformer is likely at the front end as a Pickup simulator as stated already.
I used the two gutshot provided by EQD (Rev1) and the one posted here (Rev2). I tried to follow the traces on the pictures and marked what I think is connected.
I put together a sketch of a schematic which looks very much like a Fuzz Face circuit (surprise!
). The Input section is an interpretation of what the traces look like, but this fits well with the pickup simulator described on muzique.com. I think I drew the Input cap (1uF) the wrong way round, sorry for that. Most connections to GND are just assumptions as there are no traces visible.
The piece of schematic containing the two 1M resistors is just a guess, after "duck_arse" over at diystompboxes gave me a hint that the transistor close to those resistors might be an input-buffer of the form of an emitter follower. This would go well with the fact, that the input impedance is 500k (as stated on the EQD homepage).
I'd be happy if somebody else would have any idea how the other parts are connected on the PCB and how the whole Input-section works. The two 470R resistors in the middle column of the PCB are also confusing me. One is connected to the BIAS pot, the other one is connected to the collector of Q2 but I don't understand, how the trace runs from there.
More photographs of the PCB would really help tracing this thing. Especially to find out the cap-values and the kind of transformer used. I'm already looking for used pedals in germany but wasn't lucky yet.