DOEPFER A-188-2 Manuel - Page 12

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)

Single Outputs

The six sockets ) are the "raw" outputs (taps) of the BBD

stages 3328, 2790, 1726, 1194, 662 and 396. These

outputs can be used e.g. for for feedback patching, for

external mixing (e.g. with a voltage controlled mixer) or for

multi-channel applications (e.g. 5.1 sounds).

b :

mix levels/polarities of the BBD taps

3328, 2790, 1726, 1194, 662 and 396

(polarizers)

b Mix:

wet/dry controls for outputs 1 and 2

1/2

(

1/2

(

Output 1:

mixed audio output 1

(

Output 2:

mixed audio output 2

This group of elements is responsible for the two mixed

outputs appearing at the sockets / Output 1 and ( Output

2. In the left/ccw position of the knobs 2a/b Mix the original

signal appears at the sockets //(. In the right/cw position of

the knobs 2a/b Mix the internal pre-mix signal composed

from the the six BBD taps with the polarizers

at the sockets //(. In the intermediate positions of the

knobs 2a/b Mix a mix of these two signals appears at the

corresponding output socket.

a are assigned to sub-mixer 1)

b are assigned to sub-mixer 2)

a/b appears

System A-100

Ext.FB In:

Feedback:

This group of elements is responsible for the feedback

functions of the module. Socket & Ext.FB In is the input of

the feedback loop and is normalled to socket ) BBD Out

396. Patching the feedback socket to any of the other single

output sockets another BBD tap can be used for the

feedback function to a obtain different sound. If an external

module is used to control the feedback loop (e.g. a VCA or

VC polarizer) the module has to be inserted between one of

the six sockets ) BBD Out and socket & Ext.FB In. The

feedback control

position 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 especially at short delay times as different

frequencies are emphasized or attenuated for positive or

negative feedback. For longer delay times ("analog delay"

application) the sound differences are much smaller

In the fully right/cw or fully left/ccw position of the feedback

control

the module goes into self-oscillation. As already

mentioned in chapter 2 the result in the self-oscillation state

depends upon the "audio history" (for details please refer to

page 7).

BBD Module A-188-2

external feedback input

feedback level and polarity control

(polarizer)

Feedback is a polarizer with the neutral