I've got a Gold U-Retro Deluxe that has an additional mid sweep installed by John himself. It equates to five knobs ( 4 stacked, 1 single.) The additional sweep is listed on his site as a Mid Sweep 01. Scroll down on products, you'll see it. Vol/Pan, Bass/Treb(+ bright) High Mid sweep/boost, Low Mid sweep/boost, Passive tone. The mids are switchable. This is a very, very sweet pre, and it gets any tone you need. Really amazing. [DEL]$300[/DEL] $275 shipped anywhere in the US.