Like I said, I don't think this would be best as a straight clone, the Wah does kind of suck and I just think the Wah/volume thing is useless (unlike a siren ) this really should be an add on to an awesome Wah, 'cause you know, sometimes your guitar is going wahwahwah and you just think to yourself, "if only I could sound like an air raid or impending natural disaster right now." I know I think that all the time. Anyway, here's the thread from FSB with the schematic:
http://www.freestompboxes.org/viewtopic.php?f=19&t=6682&hilit=Shin+ei+hurricane
http://www.freestompboxes.org/viewtopic.php?f=19&t=6682&hilit=Shin+ei+hurricane