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Doepfer A-107 Eurorack Multitype Morphing Filter Module

Doepfer A-107 Eurorack Multitype Morphing Filter Module

Doepfer A-107 - Multitype Morphing Filter


The Doepfer A-107 module is a completely new voltage controlled filter that has 36 available filter types: different versions of low pass, high pass, band pass, notch, all pass and filters with new response curves that have no name up to now. The filters are organised in two groups of 18 filters each. The transition between different filter types within one group can be soft (morphing) or hard (switching).


The filter was inspired by the ERWIK Musikelektronik Multimode Filter, which is based on the filter used in the Oberheim Matrix 12 resp. Xpander. The possibilities of the A-107 go far beyond these filter designs as a lot of new filter types are available and the transition between filters can be soft (morphing) or hard (switching) and the filters can be arranged in 64 different voltage controlled filter chains.


The transition between the different filter types is controlled by two parameters:

Filter Step (marked Step at the front panel)

Morphing Time (marked Morph at the front panel)


For both parameters manual control, one CV input with attenuator and one CV input without attenuator are available.


The 36 filter types can be arranged in filter chains (resp. filter sequence or filter orders) so that this sequence of filters is passed through while the control voltage changes from 0…+5V. Each chain consists of 32 steps. 64 filter chains can be programmed by the user and stored in the non-volatile memory of the module.  The following controls are used to program the filter chains:

Step: button to address the desired step (1…32) within the filter chain in combination with the value encoder

Filter: button to select the filter number (1…36) that is assigned to the current step within the chain in combination with the value encoder

Chain: button to select one of the filter chains (1…64) in combination with the value encoder

Program: button to store the current filter chain in one of the non-volatile memories (1…64) in combination with the value encoder

Value: endless rotary encoder to change the parameter selected with the buttons

3 Digit Display: the first digit indicates of the current value shows, Step ‘S’, Filter ‘F’ or Chain ‘C’, the second and the third digit display the number


Additionally, a ‘Clocked’ mode is available. This means that the steps of the currently selected filter chain are selected one after another. Each positive transition of the Clock signal calls up the next filter of the chain (jack socket marked Step Clock). A positive trigger at the Step Reset input (jack socket marked Step Reset) resets to the first filter of the current filter chain. This allows eg to switch between the filters of the currently selected filter chain in sync with a sequencer.


Of course, the standard VCF controls are available: Manual Filter Frequency Control, one CV input with attenuator and one CV input without attenuator. In addition Voltage Controlled Resonance with manual control, CV input with attenuator and CV control without attenuator are available. For the filters of the first group (1…18) self-oscillation is possible, the filters of the second group (19…36) do not feature self-oscillation.


On top of it a final VCA is available (even with manual control, CV input with attenuator and CV input without attenuator).


The filter design is 100% analog (CEM filter chip). Only the morphing control and memory managing is carried out by a microcomputer.


Specifications


Width:26hp
Max Depth:40mm
Power:+12V: +200mA

-12V: -60mA

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  • Manufacturer: Doepfer
  • Product Code: A-107
  • Availability: 1
  • £250.00
  • Exc VAT: £208.33

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