For more info go to: http://www.sourceaudio.net/products/soundblox2/orbital_modulator.php
A quick "how-to" guide on creating a vintage Leslie rotating speaker effect with the Soundblox 2 Orbital Modulator. The key to the sound is in the Orbital's ability to embed TREMOLO in to any of the pedal's chorus, flanger, or phaser effects. The Orbital also allows you to assign external expression pedal control to modulation or any of the pedals knob controls. In this case the expression pedal is assigned to modulation speed in order to re-create the rotation speed control on the original Leslie speakers.
The Soundblox 2 Orbital Modulator is a super-compact, durable, and highly flexible multi-effects pedal with a dynamic collection of precision-engineered phaser, flanger, chorus, and tremolo effects. Twelve effect types, nine adjustable parameters, plus internal or external modulation control, emphatically elevate this micro-monster well beyond the sonic limitations of traditional modulation pedals.
The Orbital Modulator's rack-mount power delivers endless modulation possibilities including multi-voiced choruses, through zero flange, rotary speaker simulation, variable notch phasers and much more. Its nine adjustable parameters include DEPTH, FEEDBACK, DELAY, FREQUENCY, VOLUME, LoRETAIN, TREMOLO, MIX, and SPEED. Control modulation either internally or externally: sine and square wave LFO plus forward and reverse Envelope Followers offer vibrant internal modulation, while the pedal's compatibility with MIDI control signals, the Source Audio Dual Expression Pedal, or any of our Hot Hand motion sensor rings provides precise external control. Once you've dialed in the perfect sound, save it one of two user presets easily recalled via two footswitches. The unit also comes with a 9VDC power supply.