$196.00 https://www.prymaxe.com/products/xotic-effects-bb-preamp-mb-overdrive BB-Preamp-with-Mid-boost-Knob; The BBP-MB takes the renowned BB-preamp to the next level. We've supplement the BBP-MB with a mid-boost control, adding more aggressive "bite" to your sound and up to +12dB of mid-treble boost.