"Classic" is the name DSM Humboldt gave it instead of MkI or V1. Whatever, that's not important. IMO, it's the best analog, zero-watt amp simulator out there. It sounds great, responds well to your playing dynamics and is tweakable enough to cover a lot of ground. If you are thinking about trying an ampless setup, this is a great way to check it out. It's ready for your board with Velcro on the back. It's in excellent condition.