Product details
Description
A-101-2 is a combination of low-pass filter (LP) and VCA. It is based on the idea of the Buchla module 292.
The term "Low Pass Gate" was introduced by Don Buchla and refers to a module that can be switched between low-pass filter and VCA, where the module control (manual or via CV) is responsible for the frequency in the first case and for the volume in the second case.
Additionally, there is a combined mode LP+VCA, in which frequency and volume change simultaneously: the quieter the signal, the duller it becomes.
Unlike the Buchla design, the A-101-2 module additionally has attenuators for both the externally supplied control voltage and the audio input signal. Furthermore, the module has a manually adjustable resonance (up to self-oscillation) and two gate inputs to control the function - besides the manual switch - also via external gate signals.
In principle, the A-101-2 is a 12dB low-pass filter that can also be switched to VCA or a combination of low-pass and VCA.
The controlling elements for the filter frequency (in LP mode) or for the volume (in VCA mode) are so-called vactrols. These components are known for their "soft" sound, which comes from the fact that they are linear elements that cause no distortion.
Due to the vactrol circuit, the signal in VCA mode is not completely suppressed even at minimal control voltage!
The frequency (in LP mode) or the amplitude (in VCA mode) can be controlled manually (F/A) and via 2 external control voltages CV1 (without attenuator) and CV2 (with attenuator).
The audio input is also equipped with an attenuator. The module's audio input is very sensitive, so that from about the setting 5 when using standard A-100 audio signals (e.g. VCO A-110), distortions can be deliberately produced by clipping at the power supply limits.
The resonance function additionally colors the sound by boosting frequencies at the filter point. The resonance can be increased up to the self-oscillation of the filter, whereby due to vactrol tolerances the self-oscillation may not be evenly available over the entire frequency range.
The resonance setting affects the output amplitude. This increases slightly at higher resonance values. However, this behavior is also found in many other filters. The resonance function was not available in the Buchla module. To maintain the sound behavior of the Buchla module, the resonance control must be turned fully counterclockwise.
The function of the module is set with a toggle switch. The left and right positions correspond to the low-pass or VCA mode. In the middle position, the low-pass/VCA combination is selected. In this switch position, the module function can also be controlled from outside using two external gate signals G1 and G2. A small table printed on the front panel shows the relationship between the gate signals and the module function (L = gate level "low", H = gate level "high").
Width: 8 TE
Connections:
CV1 input
CV2 input
Audio input
Audio output
G1 gate input
G2 gate input
Manufacturer information
Warranty
3-year BringIn guarantee according to AGB.
Payment, delivery, return
- 14 days Money back in new condition according to GTC
Specification
| Brand | Doepfer |
|---|
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