Adam Monroe's Rotary Organ was sampled from a Hammond M3 tonewheel Organ. The end goal was to simulate the sound of a Hammondnd B3 organ with rotating Leslie Speaker inside of a VST-AU plugin. Every drawbar on every note was sampled individually via the organ's built-in speaker through a Neumann TLM 102 microphone.
The signal was re-amped though a Fender Deluxe Reverb and recorded via a Sennheiser e906. Both signals were run through Grace M101 preamps. A Hammond M3 Organ combines the last two harmonics into a single drawbar, this note was omitted. Instead, a "digital foldback" teqchnique was used to extend the harmonics of the Hammond M3
to be similar to that of a Hammond B3.
The organ's range was augmented to be similar to that of a Hammond B3. This was accomplished by using the Organ's pedal tones to add the lower octave notes.
The Leslie Speaker simulation was designed to mimic a real Leslie. The signal is split to a virtual bottom rotor and virtual upper rotor at around 600 Hz. Vibrato, chorus, and panning processing are used to simulate the rotation of the rotors. The upper rotor spins between 48/409 RPM's and the bottom rotor spins between 40/354 RPM's. Bottom rotor rotation can be bypassed. The Leslie simulation can also be bypassed.
B3 effects where also digitally simulated and these include percussion, vibrato, and key click. Vibrato scanner is similar to that of a B3 and includes vibrato as well as vibrato+chorus. Key click was simulated by adding random noise to the attack and release samples. Some key click can be heard in the original samples but the effect has been exaggerated. Percussion was simulated in VST as it is in real life: a higher amplitude,
percussive decaying sound is added to the instrument via the 2nd or 3rd harmonic. The plugin also includes reverb, braking, variable acceleration, drive/distortion, smoothing, adjustable stereo panning, key-splitting, and preset switching.