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doepfer

System A - 100

Digital Noise Generator A-117

1. Introduction

Module A-117 (DNG) is a combination module, inclu-

ding a

digital noise generator

and an

808 source

The digital noise generator uses random sequences of

square waves, (18-band, with multiple slewed feed-

back loops), whose rate can go from

random clicks

pure noise. The colour of the noise is very different

from the analog noise produced by the A-118.

In addition to a manual setting, the rate can be control-

led by an external clock - eg. VCO, LFO or MIDI clock).

The 808 Source aims to re-create the sort of multi-

oscillator array

that was used in

Roland’s TR-808

and 606 drum machines as the basis of the sound of

the hi-hat, cymbals and cowbell. The cowbell mix

uses two oscillators, and the cymbals mix six.

Rate

Noise/

Cloc k O ut

A-117

DNG / 808

Ext.

Clock In

Mix 2

Mix 6

Summary of content (8 pages)

PAGE 1
System A - 100 doepfer Digital Noise Generator A-117 1. Introduction A-117 DNG / 808 Noise/ Clock Out Ext. Clock In Mix 2 Mix 6 Rate Module A-117 (DNG) is a combination module, including a digital noise generator and an 808 source. The digital noise generator uses random sequences of square waves, (18-band, with multiple slewed feedback loops), whose rate can go from random clicks to pure noise. The colour of the noise is very different from the analog noise produced by the A-118.
PAGE 2
A-117 Digital Noise Generator System A - 100 doepfer Controls: 2. DNG / 808 - Overview 1 Rate : DNG Pulse rate control for random clock / noise output ! DIG. NOISE/ 808 Source DNG / RND CLK Rate ➀ ➊ 0 10 EXT. CLK ➋ ! DNG / RND CLK : Output for random clock / digital noise " EXT. CLK : Input for external clock signal 808 Sound Source 2 In / Outputs: ➌ 6 Oscillators ➍ 2 Oscillators § 6 Osc. : Output for 808 source (6 oscillators) $ 2 Osc.
PAGE 3
doepfer System A - 100 Digital Noise Generator A-117 3. Controls 4. In / Outputs 1 Rate ! DNG / RND CLK This is used to adjust the pulse rate of the random clocks generated. At low pulse rates, individual pulses can be heard (see Fig.1, top), but with higher pulse rates (see Fig.1, bottom) the sound merges into noise. Output ! produces random clock pulses or digital noise, depending on the pulse rate set. " EXT.
PAGE 4
A-117 Digital Noise Generator System A - 100 5. User examples Module A-117 is an inexhaustible source of scraping, lip-smacking, bell or other untuned percussion sounds, so the following examples should be taken just as starting points for further experimentation. Random clock pulses With low pulse rate settings, the A-117’s output ! is a source of randomly sequenced clicks or clocks.
PAGE 5
doepfer System A - 100 Change the band pass for a high pass filter, put the cut-off to high and the resonance to minimum, and summon up a hailstorm. P A-117 Digital Noise Generator A-117 RND Experiment with different filter kinds, and settings for cut-off and resonance. You’ll find all sorts of combinations of settings and filter types that produce well usable percussion sounds. A-138 VCA ADSR 1 The A-117 as noise generator At higher pulse rates, digital noise is available at output !.
PAGE 6
A-117 Digital Noise Generator System A - 100 doepfer "Octave noise" Patch the digital noise into an A-115 Audio Divider and create extra sub-octave bands in the character of the noise. P The A-117’s digital noise is an excellent sound source for the synthesis element in the A-129 vocoder. A-117 2 Oscil. A-121 Band VCA ADSR Gate Producing percussion sounds á la TR-808 To produce a sound like the TR-808’s cowbell, use output $ (2 oscillators). Fig. 4 shows the relevant patch.
PAGE 7
doepfer System A - 100 Digital Noise Generator A-117 7
PAGE 8
A-117 Digital Noise Generator System A - 100 doepfer 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.