Being a classic multimode filter module with a State Variable topography the 505 has individual outputs for each filter type:
- low pass with a slope of -12dB per octave
- band pass with -12dB/oct
- high pass with -12dB/oct
- notch with -6db/oct
Cutoff and resonance (here: regeneration) both are voltage controllable. Each parameter has two inputs: a direct one and the other using a polarizer for attenuation.The scaleable cutoff input intentionally tracks ith 0.5 V per octave only, making possible to achieve full modualtion with "lower" voltages.
As the 505 is equipped with one audio input only we advice to use a Moonmodular 526 Reversible Mixer before the 505 because it gives you the possibility to set both level and phase of the inputs.
This is recommended when patching the individual outputs (or the Mixed output) back to the input, as this experimental procedure will result not only in creating new filter types but also in brute feedbacks.
audio: signal input
outputs: low pass output, high pass out, band pass out, notch out, mixed signal out
CV inputs: 2x Cutoff in, 2x Resonance in, Mode Control in
5U module in Moog form factor, two units wide