doepfer a-121-3 12db multimode filter price : $124.00

module a-121-3 is functionally nearly identical to module a-121-2. only the distances between the controls and sockets are smaller and rubberized, small rotary knobs are used. therefore the front panel width is only 4hp compared to 8hp of the a-121-2. in the first place it is planned for applications where only limited space is available. the only functional difference compared to the a-121-2 is the missing attenuator for the resonance cv input cq.

features:
voltage-controlled multi-mode filter with a cut-off slope of -12 db / octave (idential to the filter of the dark energy ii/iii but has been expanded by the voltage controlled resonance feature)
four simultaneous outputs are available, each with different characteristics: low-pass (lp), high-pass (hp), band-pass (bp) and notch (n)
manual control frequ. for the cut-off frequency of the filter (the cut-off frequency determines the point at which the respective filter effect appears)
two inputs for frequency control by means of external control voltages (frequency modulation, e.g. by adsr or lfo):
control voltage input cv1 without attenuator, about 1v/octave sensitivity
control voltage input cv2 with attenuator fcv2 for the adjustment of the modulation depth of input cv2
frequency range about 10hz ... 20khz
manual control q for the resonance of the filter
control voltage input cq without attenuator for voltage control of the resonance
resonance up to self-oscillation, in which case the module will behave like a sine wave oscillator even without audio input signal
audio input in with attenuator level for the adjustment of the filter input level (beyond about pos. 5 clipping/distortion occurs with typical a-100 audio levels)

this module has a maximum current draw of 40ma. it requires 4 te/hp worth of space to fit in a eurorack frame.