This is a 2U x 5U pre-assembled module based on cs80.com's iconic CS80 filter, the MOTM-480. The MOTM-480 was an OEM design by Old Crow's Synth Shop/cs80.com for Synthesis Technology in 2001. In the years since, certain key components are no longer manufactured, which prompted the redesign of the CS80 filter module into the MkII version. cs80.com's MkII filter features the same distinct sound of the Yamaha CS80 filters, but now with a greatly improved signal to noise ratio. Note: awaiting front panel shipment before these can be shipped. Only pre-order if you are willing to wait 4-6 weeks.