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コントローラー DOEPFER A-100 SeriesのPDF マニュアルをオンラインで閲覧またはダウンロードできます。DOEPFER A-100 Series 16 ページ。 Analog modular system, connecting the breakout module to the main module
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DOEPFER

Each tap is connected to two polarizers (the polarizer

function is described on the last page). One of the polarizers

is assigned to the sub-mixer 1, the second to sub-mixer 2.

The sub-mixers are labelled adder with the Σ sign (sum) in

the module scheme. The reason for the polarizers instead of

simple attenuators is that the polarity of each tap is crucial

for the output mixing (for both tap output + original signal

and even for the taps among each other).

The following sketch shows the difference between adding

and subtracting one tap output to/from the original signal by

means of a simple sawtooth signal as audio input.

Fig. 4: positive/negative mixing of original and BBD signal

System A-100

The two sub-mixers are used to mix the outputs of the six

BBD taps with adjustable levels and polarities. Each sub-

mixer has available wet/dry control to adjust the relation

between the original and the effect signal. The effect signal

is the sum of the tap outputs.

The A-188-2 features a feedback section that is very similar

to the one in the A-188-1. But as now six different BBD

outputs are available even six different feedback types are

possible. The feedback input socket is normalled to the 396

output. But by patching the feedback socket to any of the

other single output sockets another BBD tap can be used for

the feedback to a obtain different sound. Even external

feedback processing is possible (e.g. a VCA or a VC

polarizer for voltage controlled feedback, or other modules

like filter, phaser, frequency shifter, waveshaper, wave

multiplier, ring modulator or another BBD module for special

voltage controlled feedback effects). The feedback control

has polarizer function, i.e. the neutral position is at the

center. Left from the center the feedback signal is

subtracted from the input signal, right from the center it's

added (negative/positive feedback). The polarity of the

feedback signal leads to clearly audible different sounds as

different frequencies are emphasized or attenuated for

positive or negative feedback.

BBD Module A-188-2