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Fusion Preamp Interface

(1 customer review)


Connect and control rotary speakers.

The Fusion Preamp Interface is a versatile interface tool for connecting – and controlling – rotary speakers.

SKU: FPI Category:


The Fusion Preamp Interface (FPI) is designed for connecting and controlling Leslie® speaker cabinets, enabling simultaneous operation and safe speed switching. The built-in preamp provides 26db of clean gain volume, treble and bass controls with 1/4″ send and return Effects Loop.

Fusion features a 1/4″ front panel input for guitars as well as other keyboards or electronic instruments. A low-cut switch is useful for acoustic guitars, too. The gain select switch allows you to vary low or high gain to suit your application.

For speed control, a TRS 1/4″ input adds capability for a CU-1 half moon switch or a compatible foot switch. A four-position DIP switch allows for configuration of speed and timing.


  • In-line enhancement for a combo organ or clonewheel organs
  • Provides Fast/Slow/Stop and simultaneous Leslie operation
  • Safe low voltage DC speed switching
  • Built-in preamp
  • Capability to mount inside or outside of Leslie cabinet or organ


  • Send/Return Jacks – EFX
  • 1/4″ Input – Standard
  • Available in standard or configurable models

Standard Models

  • FPI-D-EFX: 122/147 6-Pin Output
  • FPI-D11-EFX: 11-Pin Input, 122/147 6-Pin Output
  • FPI-D11-11-EFX: 11-Pin Input, 11-Pin Output, 122/147 6-Pin Output
  • FPI-D6-EFX: 6-Pin Input, 122/147 6-Pin Output
  • FPI-D6-11-EFX: 6-Pin Input, 11-Pin Output, 122/147 6-Pin Output


The Fusion Preamp Interface is fully configurable with a wide variety of input and output options. Call for additional modifications or customizations.


Leslie® is a registered trademark of Hammond Suzuki Corporation.

Additional information

Weight 50 oz
Dimensions 8.75 × 5.5 × 3 in


1 review for Fusion Preamp Interface

  1. Johnny B

    This Fusion Preamp Interface is absolutely amazing! It’s just what I needed to hook my new Crumar Mojo Classic up to my 147 Leslie with Trek II EIS solid state relay. Works flawlessly and the build quality is exceptional. Nothing cheap about it. I love having the ability to use a 3-way half-moon switch (slow, stop, fast). Stop mode gives me a unique sound reminiscent of a Hammond PR-40 in good shape. The only thing I had to do was change the wiring of the Crumar half-moon switch – Crumar configures their switch differently than the Hammond CU-1. No big deal. Oh, having low voltage DC switching is brilliant. Thanks for offering such a great line of products to help keep that Hammond sound alive!

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