Doepfer A-112 User Manual
doepfer
System A - 100
1. Introduction
Sampler
A-112
A-112
SAMPLER
MIDI In
MIDI Out
Man. Trig.
Gate In
Audio IN /
Wave-CV In
CV In
Audio Out
Modus
Atten.
Tune
Run
Module
including a voltage controlled 8 bit Sampler and a
voltage controlled Wavetable Oscillator.
The module has the characteristic “grungy“ sound
of the early 8 bit Samplers and is a welcome addition to the A-100’s sound generating capabilities.
But it should not be compared with the polyphonic 16
bit MIDI samplers available on the market.
The module contains an A/D converter (ADC) for
recording the audio signal (8 bit resolution), digital
memory
converter (DAC) for playback and the control unit.
The memory is divided into two
kbyte each. In wavetable mode each bank is arranged
as 256
The memory is
sampling data in the memory is maintained.
A-112 (SAMPLER
for storage of the the sampled signal, a
of 256 bytes.
pages
non-volatile
) is a combination module,
D/A
banks
, i.e. after power-off the
(S1, S2) with 64
1
A-112
Sampler
System A - 100
doepfer
Sampling mode
In sampling mode the incoming audio signal is sampled with a
manually and from the external control voltage
input. The audio signal is converted by the ADC into 8
bit digital data and
mory (memory address 0 ... 65 535). With a sampling
frequency of 32kHz this corresponds to 2 seconds
sampling time.
During playback the sampling data in the memory is
read sequentially (address 0 ... 65535) and converted
into the corresponding audio signal by the DAC. The
sampling frequency in play mode is controlled manually and from the external control voltage input. Playback is stopped if the last memory address (65535) is
reached.
Via MIDI dump the sampling memory can be sent to a
computer for storing the data on hard-disk or any other
storage device. The computer may also transmit
sampling data to the A-112 via MIDI dump.
Wavetable mode
In wavetable mode the memory access is not sequentially but by
an external voltage. This voltage can be may generated manually (e.g. with the manual control voltage
sampling frequency
sequentially
. The
page
page number
that is controlled
written into the me-
is selected by
source A-176) or it may come from any other voltage
source (e.g. LFO, ADSR, Sequencer). Both record and
play take place in a loop whereby the complete page
is always passed through. When reaching the end of a
page the run control determines if a jump to another
page takes place or the loop remains in the same page
- depending upon the voltage controlling the wavetable/page.
Playback with a dynamic control voltage (e.g. ADSR,
LFO, Random, Sequencer, MIDI-to-CV) results in
“sweeping through“ the different pages (Wavetable
principle). If the memory of the A-112 contains suitable wavetables in the 256 pages, the result is a
voltage controlled Wavetable Oscillator with two control voltages: one for the audio frequency (pitch, tune),
one for the wavetable number.
Normally suitable wavetables are generated by a computer and transferred to the A-112 via
Effect mode
Additionally the module offers some effects, like Delay, Reverse Delay
to the 8 bit resolution these effects are not to be
compared however with the results from high-end
effect devices, but should be considered as a free
extra gift for strange sounds.
and
Pitch Shifter
MIDI-Dump.
. Of course, due
2
doepfer
System A - 100
Sampler
A-112
2. SAMPLER Overview
➄
➅
➆
➌
➃
➊
➋
A-112
VC Sampler / Wavetable Osc.
Eff
Dmp
Pit
Loop Wav
Audio In /
Wave-CV In
S1
Play
Del
Norm
Gate In
CV In
SAMPLER
MIDI Out
S2
Rec
MIDI In
Rev
FrzLen
Man.
Trig.
Run
0
0
Audio Out
10
10
Atten.
Tune
➎
➏
➍
➂
➀
➁
Controls:
1 Atten. : Attenuator for Audio/Wave CV
Input
!
Tune : Manual control for Sampling fre-
2
quency
: Gate indicator LED / overload
Run
3
warning during record
Man. Trig.
4
... 7 Switches: 3-position switches for mode se-
5
: manual trigger/start button
lection
In / Outputs:
Audio /
!
Wave-CV In
CV In : pitch control input (1V/oct.) for
"
§ Gate In
Audio Out
$
% MIDI In : MIDI input
& MIDI Out
: Input for audio signal resp. wa-
vetable control voltage in wavetable mode
tuning or sampling frequency
: Gate input
: Audio output
: MIDI output
3
A-112
Sampler
System A - 100
doepfer
3. Controls
1 Atten.
Control 1 attenuates the
!. Depending upon the mode this voltage is the audio
signal (in sampling or effect mode) or the wavetable
control voltage (in wavetable mode).
2 Tune
The tune control 2 is used to adjust the sampling
frequency (during record) or the pitch/tune during
playback (see table below).
Exception: In
pages is selected with the tune control (see following
table). In this case the sampling frequency defaults to
the last frequency that was set prior to switching into
wavetable mode.
tune
position
0 0 2,0 6 154 18,5
1 26 2,9 7 179 26,5
2 51 4,2 8 205 38,5
3 77 6,1 9 231 56,2
4 103 8,8 10 255 79,4
5 128 12,7
wavetable record
page
(appr.)
samplingfreq. [kHz]
of the voltage at input
level
mode
tune-
position
one of the 256
page
(appr.)
samplingfreq. [kHz]
H
The voltage generated with the tune control
is internally added to the voltage at input ".
This input is normally used to control the
pitch of the sampler/wavetable oscillator in
play mode with an external control voltage
following the 1V/oct standard (e.g. the A-190
MIDI-to-CV interface).
3 Run
LED 3 is used for different
depending upon the mode selected. A description of
the respective function is given in the corresponding
paragraph elsewhere in this manual.
monitoring purposes
4 Man. Trig.
Button 4
is used to trigger the sampler
Depending upon the mode selected a Trigger or Gate
leads to different actions. A description of the
respective functions is given in the corresponding
paragraph elsewhere in this manual.
manually.
H The manual trigger generated with button 4
and the signal at the gate input § are internally connected, to produce a gate/trigger
signal used for all triggered/gated functions.
The data in the table are approximate values
4
doepfer
System A - 100
Sampler
A-112
55556
S1, S2 Play Norm
Eff
67
66
Dmp Norm
Rec Norm
Pit Norm
Del Norm
Rev Norm
7
77
Loop
Wav
Loop
Wav
Loop
Wav
Len
Frz.
Len
Frz.
Len
Frz.
Function
not implemented
Dump a sample
Dump a wave
Play a loop
Play a sample
Play a wave
Record a loop
Record a sample
Record a wave
Input sample length required
Pitch Shift
Pitch Shift with "Freeze"
Input sample length required
Delay
Delay with "Freeze"
Input sample length required
Reverse Delay
Reverse Delay with "Freeze"
5 Switch • 6 Switch • 7 Switch
With the 3-position switches 4 to 6 the operating
mode is selected. The table on the left lists all possible
modes. The modes are described in the following
paragraphs.
In particular the gate signal (gate input § / manual
trigger 4) controls different functions in the respective
operating modes.
H
Please note that in some modes it is not
sufficient to change the switches position to
exit the mode. In the following description of
the modes you will find detailed information
on how to exit a selected mode.
5
A-112
Sampler
System A - 100
doepfer
• Normal record mode
55556
67
66
S1,S2Rec Norm
In this mode an audio signal at audio input 1 is
recorded into one of the 2 memory banks S1 or S2
(depending upon the position of switch
Gate = low :
In this case the pre-listening mode is active (LED 3
is off); the audio signal at input 1 is digitized by the
ADC, re-converted by the DAC and forwarded to audio
output 4 for pre-listening.
The pre-listening mode contains an
ping function: as soon as the audio signal exceeds a
predefined upper or lower threshold the LED 3 lights
up for a short moment (about 10 ms). During this time
the audio signal is not scanned and the output remains
at the last DAC value. The onset of clipping (i.e.
overload distortion) is immediately audible.
Audio / Wave-CV In
7
77
Audio signal sampling fre-
Tune / CV
quency (while
Gate = low)
5).
overload/ clip-
H The sound quality in the pre-listening mode
is very poor. The quality if a signal is recorded and played back is much better!
The pre-listening mode is also used to find out and
set the sampling frequency. When record mode is
entered (see below) the last sampling frequency in
pre-listening mode is used.
Gate = high:
When the gate level changes from low to high Record
is triggered and the audio signal is sampled into the
memory bank selected with switch
on. Recording starts at address 0 and continues until
the last address (65 535) is reached and LED 3 turns
off. If gate turns low before the end of the sampling
memory (address 65 535) is reached the record process stops. You can use this function to sample chosen segments of sound.
5. LED 3 is now
• Normal play mode
55556
67
66
S1,S2Play Norm
In this mode a previously recorded sample in the
sampling memory (S1 or S2, depending upon the
position of switch
Audio / Wave-CV In
7
77
- - - - - - - sampling fre-
5) is played back.
Tune / CV
quency
6
doepfer
System A - 100
Sampler
A-112
Gate = low:
The module is waiting for gate = high; LED 3 is off
(see fig. 1 - a).
Gate = high:
When the gate level changes from low to high
back is triggered and the audio signal in the memory
bank is played back. LED 3 is now on. Playback starts
at address 0 and continues until the last address (65
535) is reached and LED 3 turns off. Even if the gate
goes low before the end of the sampling memory is
reached the playback continues (see fig. 1 - b).
Only if the gate goes low and high again before the
end is reached the sample is retriggered, i.e. the
playback starts again at address 0 (see fig. 1 - c).
If the gate is still high when the end of the sample
memory is reached the playback stops (i.e. no loop if
gate remains high). For this purpose the loop mode is
used.
Play-
Audio
Out
Gate
fig. 1: normal play mode
•
55556
S1,S2Rec Loop
This mode is very similar to the normal record mode
(see above). The only difference to the normal re-
cord mode is that record continues when the end of
the sample memory is reached and the gate level is
still high
Sa m p l e
a
b
Loop record mode
67
66
.
Audio / Wave-CV In
7
77
c
Tune / CV
audio signal sampling fre-
quency (only if
Gate = low)
7
A-112
Sampler
System A - 100
doepfer
In this case the record starts again at the first memory
address. This loop continues (LED 3 on) until gate
turns low.
• Loop play mode
55556
67
66
S1,S2Play Loop
Audio / Wave-CV In
7
77
- - - - - - - - - sampling fre-
In normal play mode the playback stops if the end of
the sample memory is reached. The loop play mode
allows the
continuous playback of a pre-defined
section of the sample memory.
Gate function:
As long as the gate level is high the sample is played
continuously. When the end of the sample is reached,
playback starts again at the beginning (see fig. 2 - a).
LED 3 is on.
As soon as the
gate goes low
the present position
within the sample is defined as loop end (see fig. 2 -
b). Playback starts at the beginning (address 0) and
runs continuously from the beginning to the loop end
Tune / CV
quency
as long as the gate level remains low (see fig. 2: loop
1).
If gate turns high (see fig. 1 - c) the loop end is
cancelled and the sample playback uses the full range
again (i.e. loop end = end of sample memory, see fig.
2 - d).
If the gate goes low again a new loop end is set (see
fig. 2 - e, loop 2).
To
loop play mode a short
exit
trigger pulse
(max.
duration 100 ms) is required (see fig. 2 -f).
Audio
Out
Gate
Sam pl e
b
c
a
Loop 1
d
e
Loop 2
fig. 2: Loop play mode
f
8
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