A multi-frequency booster with a 12 position frequency selector and a gain function. It allows you to choose which frequency you choose to boost. That is very important since it helps marry your guitar with whatever amp you are using.
If your guitar is too bassy, choose a high frequency to boost. If you have humbuckers and you wish a single-coil sound, choose a higher frequency. If you have a single coil and want to fatten it up, use a low frequency. The same goes with the amp.
This pedal can be used on a microphone for effects, bass guitar, keyboards, nylon electric, horns, digital mixes, the combinations are endless.
I build them with Germanium transistors that are about 40 years old and have smoth clipping, not with silicon transistors that have a tendency to sound like razor blades. Of course, I only have a limited quantity of those transistors so you may want to take this into consideration when ordering.
This pedal has been hugely popular with L.A. based studio musicians as well as Emmy winning producers. It is also great for live performances. These are true Bypass and have an insert for a 9-volt wall wart and have an LED as well for instant recognition.