http://www.superpage.com/riffs/desc_..._echoplex.html
that's how they used to do it in the good ol' days^ and i know that john martin did it in the good ol' days. I've been wanting one for ages, but i don't know whether damo uses the actual thing, or whether he uses a digital pedal to synthesise it.
they seem quite hard to get ur mits onto, and they're pretty expensive. But still... i want one
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http://cgi.ebay.co.uk/Vintage-MAESTR...QQcmdZViewItem