The RS-240 analogue frequency Shifter Module by Analogue Systems

The Analogue Systems RS-240 is a Bode-style analogue frequency shifter module designed for modular synthesizer systems, faithfully recreating the classic circuitry originally developed by Harald Bode. Unlike pitch shifters, it shifts the entire frequency spectrum of an incoming signal by a fixed amount, enabling unique inharmonic and experimental effects. The module offers both linear and exponential frequency shifting, allowing everything from subtle detuning to extreme spectral transformations. It provides simultaneous upward and downward shifted outputs, which can be used independently or blended together for complex textures. With multiple CV inputs and a wide range of scaling options, it is highly versatile for modulation and sound design. Additionally, a built-in squelch (noise gate) helps reduce unwanted noise and artifacts during quieter passages.

Specs:

• Module type: Analogue Bode frequency shifter
• Width: 24 HP
• Depth: ~122 mm (≈4.8")
• Power consumption: ~70 mA (+12V), 70 mA (−12V), 70 mA (+5V)
• Frequency shift range: up to approx. ±5 kHz (linear modes)
• Scale modes: Zero, EXP, 5 Hz, 50 Hz, 500 Hz, 5 kHz
• Control: Large manual pitch knob + scale selector switch
• CV inputs: 3 × CV inputs (±10V range, summed)
• Audio input: 1 × signal input (approx. ±10V, 30 Hz–16 kHz)
• Outputs:
• Out A (downward shifted)
• Out B (upward shifted)
• 3 × Mix outputs (blend of A & B)
• Additional features:
• Exponential & linear shifting modes
• Zero adjust calibration control
• Squelch (noise gate) with threshold control

Owner's manual