The VCF24db is a fat sounding transistor-ladder low-pass. Special features include automatic gain correction and a beefy distortion circuit. The module can self-oscillate. While doing so, it is possible to play it like an oscillator. Furthermore, there are individual outputs for audio material filtered with an edge steepness of -6 dB, -12 dB, -18 dB and -24 dB per octave. A fifth output can be switched between the slopes mentioned. One of two inputs is adjustable in level. Cutoff frequency and resonance parameters come equipped with CV inputs plus attenuators.
Transistor Ladder Filter w 1-4 poles LP and SELECT aux out Two audio in (one adj) and two CV In (one adj)
Cutoff, Res, w Automatic Gain Change and ext CV in Distortion, Amt Res CV In
Panel Width: 10 HP +12V = 90mA -12V = 60mA
+5V = 0mA
CONTROLS
FREQUENCY: Cutoff Frequency of the Filter
RESONANCE: Resonance
AGC: Automatic Gain Compensation On/Off. For taming extreme level variations at high Resonance positions
AMT RES CV: Amount of ext CV connected at RES CV input port for Resonance control
OVERLOAD LED: ligths when audio signal goes too high
DIST: amount of distortion
SLOPE: selection of filter slope (6, 12, 18, 24 dB/Oct). Selected Slope appears at SELECT out port
IN1: level attenuator for audio signal connected at IN1 port (signal at IN2 port goes always at full level unattenuated)
FM: attenuator for ext CV signal connected at FM input port
CONNECTIONS
IN1: audio input signal 1, scalable w. IN1 control
IN2: full range, unattenuated, audio input signal 2
1V/OCT: unattenuated, 1V/Oct CV input for ext keyboard or sequencers
FM: audio/CV input signal, scalable w. FM control for Cutoff Frequency modulation
RES: CV input signal for Resonance modulation
6dB: audio out for 1-pole low pass filtered signal
12dB: audio out for 2-pole low pass filtered signal
18dB: audio out for 3-pole low pass filtered signal
24dB: audio out for 4-pole low pass filtered signal
SELECT: audio out for filtered signal w. steepness selected thru SLOPE switch