Note: 3 preamp mode. The Preamp offers awide variety of sounds. It's capable of a 30dB+ clean boost with an adjustable ±15dB two band active EQ which adds a wide range of harmonic content to your ideal sound. The BB also utilizes a pre-gain stage which allows the Pedal to go from a very pristine clean to a very smooth,compressed, overdriven sound. The PREMAP-MB takes the renowned BB-preamp to the next level. We've supplement the BB PREAMP-MB with a mid-boost control,adding more aggressive "bite" to your sound and up to +12dB of mid-treble boost. The MB version capable of covering all the tones that can be obtained with the standard BB Preamp by setting the mid control at 9 o'clock. The PREAMP-COMP. Users will have the ability to choose, standard compression (current BB-PREAMP), more compression (Andy Timmons BB-AT) and no compression. The BBP-COMP rolls two iconic pedals into one while taking it's sound to a level with a no compression option. Effect On/True Bypass Control: Gain,Volume,Treble,Bass,Mid Boost, norm/comp switch Input Impedance: 1M ohm Output Impedance: 2K ohm Dimensions (W/D/H): 115mm X 65mm X 50mm Weight: 270g Bypass: True Bypass Switching Power Consumption: 9VDC/100mA(Max) Power Supply: 9VDC, Negative Tips(not included) Color: Purple Material: Metal Package Contents: 1 * Guitar Effect Pedal