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API Select TranZformer LLX Pedal

Bass EQ, boost and overdrive pedal featuring proprietary 2510 OpAmp, signature API output transformer, and 3-band EQ each with ±15 dB of gain

MFR# TranZformer LLX

Product Description

API’s tone-shaping circuitry and preamps have been legendary in the recording world, and that same circuitry is finally available as a powerful multi-faceted and tone-shaping pedal for bass guitars. The API Select TranZformer LLX Compressor Pedal easily offers a helpful spread of boost, EQ, and overdrive options within a clean layout that’s easy to use and won’t overrun any pedalboard real estate. 

The API TranZformer’s primary feature is the powerful EQ section with three bass guitar-specific frequencies that offer up to +/- 15dB per band. With a quick twist of the knobs, users can effortlessly carve out a variety of perfect bass tones at a moment’s notice. Bassists can now enjoy pushing the lows for pulsing dub-like thump or even bumping the mids and highs into a timeless, raggedy, and cutting overdrive. The TranZformer Pedal can intuitively tackle hundreds of tones in between these options.


The API Select TranZformer LLX incorporates API's legendary equalizer circuit into a versatile and compact bass effects pedal. Made to easily fit on any pedal board and run on standard 9V or 18V power supplies, the API LLX Pedal offers ±15 dB of gain on three bass guitar-centric requencies. In addition, the gain stage can even be switched from Clean Boost to Overdrive mode to help drive the input OpAmp and add more tones to your bass rig. Other features include the TranZformer’s buffered bypass,  selectable peak/shelf for upper frequency range,-20 dB output pad, transformer output, and that timeless API sound. 


The API Audio TranZformer Pedal offers 3-band selectors (100Hz, 400Hz, and 2kHz). The lower bands have a bigger effect on overall core tone and fundamental notes while the higher 2kHz band affects upper-register fundamentals, harmonics, and overtones. Each of the TranZformer’s knobs offer +/- 15dB with a locking indent in the center for a neutral equalizer option. The 2kHz range uses a peak/shelf toggle that can alter the character of the user's attack similar to a frequency-specific compression. The entire peak/shelf toggle is useful when running the TransZformer Compressor Pedal in overdrive mode or when playing with a simple pick. Finally, the TranZformer features a -20dB output pad toggle perfect for active pickup players or high-gain pedalboards. Order today!


  • Proprietary API 2510 OpAmp
  • Signature API output transformer
  • 3-band EQ each with ±15 dB of gain
  • OpAmp overdrive circuit
  • 40 dB of gain
  • -20 dB output pad
  • Buffered bypass

Product Specifications

Condition New

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