Doepfer A-117 Digital Noise / 808 Source - Manual (Page 6)

A-117 Digital Noise Generator System A - 100 doepfer
6
"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.
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.
With that same patch, you can also produce hi-hat
and cymbal sounds, using output § (6 oscillators). IN
this case, the filter cut-off point neds to be about 10
kHz.
P Instead of the band pass filter, you can use a
low pass filter for the cowbell sound, and a
high pass filter will work for hi-hat and cym-
bal sounds.
Try other settings for filter cut-off and reso-
nance, and other types of filter, to produce all
sorts of different percussive sounds.
Fig. 4: producing a TR-808 cowbell sound.
Use full range digital noise as source material for
noises and percussive sound effects, patching it
into an A-128 fixed filter bank and VCA, which in turn
is controlled by an ADSR. Experiment with all sorts of
different combinations of filter bank settings.
Another thought: the 6 oscillator signal at output § of
the A-117 works very well as an excellent sound
source for the synthesis section of the A-129 vocoder
(A-129/2).
A-117
Gate
VCA
ADSR
2 Oscil.
Band
A-121