In 1983, Ibanez/Maxon built something absurd: the DM2000, a 12-bit digital delay so over-engineered that it made everything else look like a toy. Forty years later, Trey Anastasio has been abusing one onstage, using its Hold function to create infinite, warbling loops called the "Funk Siren." The only problem? Vintage…Click on the title for more