The SolidGold FX Zeta Deluxe Overdrive is an update to the Zeta Overdrive. There are new switches for controlling clipping modes and body and mid switches to fine tune frequencies. The Zeta Deluxe is a one stop shop for overdrive, boost and everything in between.
Read more about the SolidGold FX Zeta Deluxe Overdrive here: https://goo.gl/Q8ecK1