DOEPFER A-155 Manual Download Page 5

doepfer

System  A - 100

Analog / Trigger Sequencer

  

A-155

5

CV knobs (upper row)

You use the CV knobs 

4

 (upper row) to set the

voltage

 

output for each step

 in the upper analog CV

row. The control voltage set for each step is output at
the upper 

Pre Out

 

§

 socket.

The 

range of voltage output

 can be controlled with

the range switch 

6

. Three very accurate voltage ran-

ges are provided (see below) so that the upper analog
CV row is ideally suited for precise 

VCO pitch control.

 

CV knobs (lower row)

You use the CV knobs 

5

 (lower row) to set the 

voltage

output for each step

 in the lower analog CV row.  The

control voltage set for each step is output at the lower

Pre Out

 

§

 socket.

You use the 

Scale control 

7

 to adjust the

 range

 of

the voltages controlled by the CV knobs.

If for any step you patch in an 

external CV /

audio input

 (socket 

$

), the corresponding-

knob in the lower row doesn’t put out its own
voltage.

Instead, it acts as  an  

attenuator 

for the

external CV / audio signal,

 

before sending it

to the

 

lower  

Pre Out

 output 

§

.

Range

The position of the 

Range switch

 (a three-way toggle

switch) 

6

 selects the precise 

voltage control range

,

within which the upper row of CV knobs 

4

 will operate.

There are three ranges to choose from:

• 

up 

:

1 V

(i.e. one octave)

• 

centre 

: 2 V

(i.e. two octaves)

• 

down 

: 4 V

(i.e. four octaves).

The maximum voltage is obtained by turning the knobs
fully clockwise.

Scale

Control 

7

 sets the  

range of control voltages

, within

which the lower row of CV knobs 

5

 will operate. If an

external CV / audio signal is patched into any of the
sockets 

$

, the scale control affects the amount of

attenuation 

the CV knob will produce on that voltage

.

Glide

The internal

 slew limiter's

 rate is set with control 

8

.

If for the current step in a sequence (e.g. step three)
the slew limiter is switched in (by a

 "low"

 control

signal at the 

Glide Ctrl.

 

§

 socket), the control voltage

sent to output 

Post Out

 

§

 doesn’t jump instantly from

the voltage at the previous step (in this example, step
two).  Instead, it glides gradually to the new voltage, at

Summary of Contents for A-155

Page 1: ...ith which to set the control voltage for each step The upper row is particularly designed for pitch control of a VCO with a range switch giving the ability to set pitches precisely The lower row of ei...

Page 2: ...0 10 0 10 5 0 10 0 10 6 0 10 0 10 7 0 10 0 10 8 0 10 0 10 0 10 Range Glide Scale Glide Trig 1 Trig 2 Trig 3 Gate Trig Control External CV Audio Inputs Trigger Outputs Control Start Stop Step Reset Pre...

Page 3: ...he glide time amount of slew on either upper or lower CV row 9 Control manual controls Start start button Stop stop button Step button for manually stepping through a sequence Reset reset button In Ou...

Page 4: ...utput down gate output on row 4 Gate output The three upper rows produce triggers each step that is switched to a row will produce a short pulse like a clock signal The lowest row produces gates the s...

Page 5: ...it acts as an attenuator for the external CV audio signal before sending it to the lower Pre Out output 6 Range The position of the Range switch a three way toggle switch 6 selects the precise voltage...

Page 6: ...gate activates glide fig 2 glide function 9 Control The control section 9 includes four push buttons for manual sequencer control Alternatively digital control signals can be sent to four correspondin...

Page 7: ...no difference a pulse of long duration still just produces a momentary trigger Clock step and Reset inputs on the other hand work by sensing level so for instance Reset will always be active keeping t...

Page 8: ...ches are set suitable Without the use of the S H you would have to adjust the potentiometers of the regarding steps very careful to obtain exactly the same voltage for the successive steps External CV...

Page 9: ...requency Trigger row 3 is available for any other control job you choose Variations on the patch in fig 3 might include controlling the VCF with either the same or a different ADSR or using the lower...

Page 10: ...Trigger Sequencer System A 100 doepfer 10 fig 3 standard patch with VCO VCF and glide control 1 2 3 4 5 6 7 8 VCO Clock Trig 1 VCA VCF ADSR Trig 2 Gate Glide Ctrl S H Crtl 1 Pre Out 2 Reset Post Out 1...

Page 11: ...cay time in a VC ADSR In fig 4 the lower analog CV row controls the decay time of a VC ADSR This in turn controls the cut off frequency of a VCF and so produces filter accents of different lengths 1 2...

Page 12: ...atch in fig 6 shows how to use the A 155 as a 16 step sequencer with one single analog CV row What s needed are the Clock Divider A 160 output 8 and the two voltage controlled swit ches in the A 150 V...

Page 13: ...igger Sequencer A 155 13 fig 6 16 step sequence with single analog CVs 1 2 3 4 5 6 7 8 Clock Trig 1 Post Out 2 A 160 Trig 3 CV O I A 150 I O 1 I O 2 CV O I A 150 I O 1 I O 2 Trig In 8 Trig 1 Trig 3 Tr...

Page 14: ...MIDI Clock with the help of an A 190 module the Clock and Reset outputs of the A 190 are simply connected to the Clock and Reset inputs on the A 155 Random Clock The Random Clock output from the A 117...

Page 15: ...l fit onto an A4 sheet of paper Photocopy this page and cut out the pictures of this and your other modules You can then stick them onto another piece of paper and create a diagram of your own system...

Page 16: ...8 0 10 0 10 0 10 Range Glide Scale Glide Trig 1 Trig 2 Trig 3 Gate Trig Control External CV Audio Inputs Trigger Outputs Control Start Stop Step Reset Pre Out Pre Out S H Ctrl Post Out S H Ctrl Post...

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