The API Select TranZformer LLX incorporates API’s legendary EQ circuit into a versatile and compact bass guitar effects pedal. Designed to easily fit into your pedal board and engineered to run on standard 9V or 18V power supplies, the LLX offers +/ - 15dB of gain on 3 bass guitar specific frequencies. Additionally, the gain stage can be switched from Clean Boost to Overdrive mode to drive the input OpAmp and add even more tones to your arsenal . Other features include a buffered bypass , - 20d B output pad, selectable peak/shelf for upper frequency range , transformer output, and of course the classic API sound