Anyone tried the Seymour Duncan SFX-03 Twin Tube pedal, for bass? I did a TB search on SFX-03 but no results. Looks interesting for use as a tube preamp pedal. It uses the 6021 miniature tubes, run at high voltage. http://www.seymourduncan.com/news/press.shtml http://www.seymourduncan.com/products/effectsdescr.shtml#booster From the Seymour site: "SFX-03 twin tube classic Boutique quality and design for the working musician. The sound is classic rock n roll. application High-quality, two-channel, guitar preamp. Uses a duet of premium, mil-spec, subminiature, USA-made Phillips-Sylvania® 6021 dual triode tubes. Great for country, blues, surf, classic rock. description The high-plate voltage and 100% vacuum tube signal path allows the tubes to operate at their fullest potential and provide maximum dynamic range. The means you get the most gain and all the smooth tone you expect from a high-quality tube preamp. Two channels provide versatility. True bypass. Fully encapsulated toroidal transformer for quiet operation. Heavy duty steel chassis."