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System A - 100

Clock Sequencer A-161

1. Introduction

Module A-161 is an eight-step Clock Sequencer

which is internally connected to the Clock Divider

(A-160)

Eight outputs

are sequentially switched by

the clock signals from the A-160 (see Fig. 1) and can

act, for instance, as sequential rhythmic triggers for an

envelope. The reset on the A-160 also works on the

A-161 (instant return to Step 1).

Installation in the rack system:

The A-161 must be positioned

directly to the

right of the A-160.

Join the two modules with the supplied 10-way ribbon

cable. Use the

upper

10-way socket on each module.

Make sure that the ribbon cable isn’t twisted, and that

the colour-coded section is oriented the same on both

modules.

Only join the

A-160

to the

system bus

! Leave the

lower 10-way socket on the A-161 unused.

A-161

Clock

Sequencer

Summary of content (10 pages)

PAGE 1
System A - 100 doepfer Clock Sequencer A-161 1. Introduction 2 Module A-161 is an eight-step Clock Sequencer which is internally connected to the Clock Divider (A-160). Eight outputs are sequentially switched by the clock signals from the A-160 (see Fig. 1) and can act, for instance, as sequential rhythmic triggers for an envelope. The reset on the A-160 also works on the A-161 (instant return to Step 1).
PAGE 2
A-161 Clock Sequencer System A - 100 doepfer Indicators: 2. Overview 1 LED ... 8 LED : Status indicators for each output A-161 CLOCK SEQUENCER ➀ ➁ ➂ ➃ ➄ ➅ ➆ ➇ 2 1 2 3 4 5 6 7 8 Outputs: ! 1 ...
PAGE 3
doepfer System A - 100 Clock Sequencer A-161 3. Indicators 1 LED ... 8 LED LEDs 1 to 8 are the status indicators for outputs ! to (. 4. Outputs ! 1 ... ( 8 Outputs ! to ( are the source of the sequential triggers that the A-161 puts out (see Fig. 1). Clock A-160 Fig.
PAGE 4
A-161 Clock Sequencer System A - 100 5. User examples "Rhythmatising" notes In the example in Fig. 2 (see next page) notes played on the keyboard are ‘rhythmatised’: ie. they’re converted into a rhythmical tonal sequence by a combination of four envelopes and the A-161. The frequency of the LFO’s square wave determines the speed of the resulting rhythmical pattern, and the note length as well - in this case, eighth notes.
PAGE 5
System A - 100 doepfer CV VCO Clock Sequencer A-161 VCA Gate A-138 a A-165 Reset LFO +/- Out ADSR 1 ADSR 2 ADSR 3 ADSR 4 Reset A-160 A-161 1 2 3 4 5 6 7 8 Abb. 2: "Rhythmatising” notes P Instead of an LFO, you can also use MIDIclock signals from a MIDI/CV interface (such as the A-190) to produce MIDI - synchronised patterns.
PAGE 6
A-161 Clock Sequencer System A - 100 Creating complex envelopes A small modification to the previous patch is shown in Fig. 3. Here, the Clock Sequencer outputs are connected to a series of Slew Limiters (A-170), to create one very complex envelope. doepfer A-161 Clock Sequencer 1 A-170 2 A-138 a 3 The Clock Sequencer triggers the Slew Limiters in sequence, and their various envelopes are mixed in a linear mixer A-138a.
PAGE 7
doepfer System A - 100 Different envelopes with each note played With the patch in Fig. 4, every time a new note is played, a different envelope will control the VCF. Clock Sequencer A-161 A-161 A-138 a Clock Sequencer ADSR 1 MIXER In 1 Input 1 In 2 Each gate signal from the keyboard moves the A-161 another step forward, and so triggers the next envelope. The envelopes obviously need to have different settings for the effect to be noticeable.
PAGE 8
A-161 Clock Sequencer System A - 100 Mini analog sequencer The patch in Fig. 5 produces a four-step mini analog sequencer. A clock signal either from an LFO, or a MIDI-CV interface (A-190) sequentially steps through the A161’s outputs. These are fed into the inputs of an A-138a linear mixer. Whan an A-161 is active, it puts out a +5 V signal. Use the input attenuators on the A-138 to set each of the voltages in the sequence.
PAGE 9
doepfer System A - 100 Clock Sequencer A-161 6. Patch-Sheet The following diagrams of the module can help you recall your own Patches. They’re designed so that a complete 19” rack of modules will 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. Make multiple copies of your composite diagram, and use them for remembering good patches and set-ups.
PAGE 10
A-161 Clock Sequencer 10 System A - 100 doepfer