Submitted by AULOS from Hereford Uk (480 points) on May 5, 2010
I came across this SDI-1 along with the SMM-1 Metal Master and SOD-1 Overdrive (Neither listed.) They tend to go for bargain money and I say, pick one up. They have 2 outputs so you can make self-oscilaters out of them. They are actually pretty good on a clean vavle channel. I have only tried them with a clear signal chain. Definately worth 20 for some noise.