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Arrived very quickly from Hong Kong and seems well worth the £28.88 it cost me.
It's supposed to emulate an AC-30 tone a la the Catalinbread CB30 and Tech21 Liverpool (which it's largely ripped off from according to thee interwebz).
What it seems to be, in essence, is a clean boost which becomes an overdrive pedal at higher (Voice) settings with 3-band Eq. I believe there's some amp modelling involved, but I'm not clued-up enough electronically to know which components do what.
Does it sound like an AC30, though? Well I sold mine in 1990 or so - and, yes, I'm still kicking myself about that - so I can't do a direct comparison, but it does deliver some nice guitar tones ranging from sparkly cleans on the edge of breaking up through to a very nasal-sounding overdrive. There's probably a lot more in there - I obviously just quickly set it up for my own tastes and haven't fully explored it just yet.
I can see myself getting plenty of use out of it. I think it could be good with my Ric, after the Janglebox. I liked it a lot with my Jazzmaster through my Epi Valve Jr. for sure. Can't help but wonder how it would sound into an AC30. Would they cancel each other out or would it be like having a threesome with hot twins?
In summary: £28.88, people! It's a no-brainer, even if you just want a clean boost, an overdrive or some Eq in your chain.