This little box is my favorite of the trio. It adds “presence and sparkle” to the guitar sound. It makes your guitar “step out” from the noise. It was designed specifically as a “clean boost” to compensate for signal loss or low gain pickups (RC = Rig Conductor). It includes a 20db gain boost and a +/- 15db Treble and Bass control. In some scenarios, this pedal can serve more as a buffer to help boost low gain pickups into your amp or compensate for signal loss while using lots of pedals. It can also help drive your amp in to a sweet overdrive. It does this really well on my 71’ Fender Deluxe Reverb.
I think this pedal works best with a Strat or Tele style guitar. While playing my Strat, I literally keep it on all the time. Essentially, it beefs up my sound while adding a little bit of grind. It allows me to achieve a little breakup too when I pluck harder or by turning up the guitar volume. I can, however, still stay clean with the guitar volume turned down or by playing softly. It is very “user responsive”. The treble and base controls are very usable and allow me to get a very natural tone. In other words, it sounds like you are just playing through a very nice amplifier with a warm presence and a slight breakup. One of the best features of this pedal is the treble and base control. You can really dial in on your desired tone.
I think this pedal should be used in two ways. First, it can be used as a straightforward clean boost. Switching from your normal guitar sound to the RC Booster does not dramatically change the character of your guitar. It just sounds like you turned up your amp. The other mode, which I prefer is to keep it on all the time and give you that “RC presence” and a slight gain breakup sound. This works extremely well with my Strat.
Listen to the sound samples to the left. The first part of the phrase is played without the RC. Then, you here me click in and you can hear the clarity step out with a little grit!