The Doepfer A-138j is a 6HP, four channel mixer with an additional polarity/mute switch for each input.
In the upper position of the corresponding switch the inverted signal is used. In the center position the input in question is turned off (mute) and in the lower position the "normal" (i.e. non-inverted) signal is used.
The inverting of signals is used especially for control voltage signals (e.g. LFO, ADSR). But even for correlated audio signals this feature is useful. For example for feedback applications or the mixing of original and processed signals (e.g. original and filtered signal to obtain new filter types).
The module is equipped with two types of single outputs and a dual mix output. All inputs and outputs are DC coupled. Consequently the VCAs can be used to mix both audio and control voltages.
Each input is - apart from the polarity/mute switch - equipped with a linear attenuator. The amplification range is 0....1.
Product Specs
- Item Number: 23487
- Make: Doepfer
- Model: A-138j
- Condition: Brand New
- Finish: Silver
- Categories: keyboards-and-synths ⇒ eurorack
- Function: Mixer Utility Polarizer Quad
- Made In: Germany
- MPN: A-138j
- EAN: 4250711113933
- Modular Grid: Eurorack ⓘ ＋
- Dimensions*: 6 HP 40 mm deep
- Power*: 20 mA +12V 20 mA -12V 0 mA 5V
* User contributed details