System A - 100 doepfer Sampler A-112 1. Introduction A-112 SAMPLER MIDI In MIDI Out Modus Man. Trig. Gate In Audio IN / Wave-CV In CV In Atten. Tune Audio Out Run Module A-112 (SAMPLER) is a combination 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.
A-112 Sampler System A - 100 Sampling mode In sampling mode the incoming audio signal is sampled with a sampling frequency that is controlled manually and from the external control voltage input. The audio signal is converted by the ADC into 8 bit digital data and sequentially written into the memory (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 ...
System A - 100 doepfer Controls: 2. SAMPLER Overview A-112 SAMPLER VC Sampler / Wavetable Osc. S1 ➄ Eff ➅ Dmp ➆ ➌ ➃ ➊ Play 1 Atten. : Attenuator for Audio/Wave CV Input ! 2 Tune : Manual control for Sampling frequency 3 Run : Gate indicator LED / overload warning during record 4 Man. Trig. : manual trigger/start button MIDI Out S2 Rec Pit Del Rev Loop Wav ➎ MIDI In ➏ Len Norm Frz Man. Gate In Trig. Audio Out Run Audio In / Wave-CV In Atten. 0 Tune ➋ 0 10 5 ...
A-112 Sampler System A - 100 H 3. Controls 1 Atten. Control 1 attenuates the level of the voltage at input !. Depending upon the mode this voltage is the audio signal (in sampling or effect mode) or the wavetable control voltage (in wavetable mode). The tune control 2 is used to adjust the sampling frequency (during record) or the pitch/tune during playback (see table below). Exception: In wavetable record mode one of the 256 pages is selected with the tune control (see following table).
System A - 100 doepfer 5 6 Dmp S1, S2 Play Rec Pit Eff Del Rev 7 Function Loop not implemented Norm Dump a sample Wav Dump a wave Loop Play a loop Norm Play a sample Wav Play a wave Loop Record a loop Norm Record a sample Wav Record a wave Len Input sample length required Norm Pitch Shift with "Freeze" Len Input sample length required Delay with "Freeze" Len Input sample length required Frz.
A-112 Sampler System A - 100 • Normal record mode 5 S1, S2 6 7 Rec Norm Audio / Wave-CV In Audio signal Tune / CV sampling frequency (while Gate = low) 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 5). 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.
doepfer System A - 100 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 Playback 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).
A-112 Sampler System A - 100 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 5 S1, S2 6 7 Play Loop Audio / Wave-CV In Tune / CV --------- sampling frequency 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. doepfer as long as the gate level remains low (see fig. 2: loop 1).
System A - 100 doepfer • Wave record mode Sampler A-112 Gate = high: 5 6 7 Audio / Wave-CV In Tune / CV S1, S2 Rec Wav audio signal sampling frequency (if gate = low) / wavetable number (if gate = high) In this mode one or more wavetables are recorded into the memory bank selected. The number of the wavetable (page) results from the position of the Tune control 2 and the voltage applied to the CV input ".
A-112 Sampler System A - 100 In fig. 3, the CV input is fed from the sine output of a LFO. The sampling frequency is 32kHz, the LFO frequency 21 Hz. The resulting wavetable pages are shown in the boxes. +5 V 243 220 5 6 7 S1, S2 Play Wav Audio / Wave-CV In Tune / CV Number of wavepage sampling frequency In this mode A-112 works as a wavetable oscillator.
System A - 100 doepfer i.e. the next wavetable and the next sampling frequency are determined. This continues until the gate goes low. When a dynamic voltage -2.5...+2.5V is used as the wavetable control voltage (e.g. ADSR output connected to audio/wave input !) wavetable are swept.
A-112 Sampler H System A - 100 During Data transmission via MIDI OUT the MIDI input and gate are not scanned. Therefore a new dump cannot be triggered by mistake. As soon as the gate goes high (e.g. by pressing button 4) the sample memory is transferred as a SysEx dump via MIDI OUT and LED 3 turns on (same function as sample dump request via MIDI in). To trigger a sample dump manually a short high gate level is sufficient. It is not necessary to keep the gate level high.
doepfer System A - 100 The length of the delay memory is defined by the parameter Len (see below). The maximum length is the complete sampling memory (64kbyte = 65536 bytes). With a sampling frequency of 32 kHz this corresponds to 2 seconds delay time. The actual delay time is decided by a combination of the length of the delay memory (Len) and the sampling frequency. Gate = low: The module is waiting for gate = high; LED 3 is off. The initial sampling frequency is set.
A-112 Sampler H System A - 100 All functions and controls (sampling frequency, length of delay memory ...) are the same as in the normal delay mode (see above). • Pitch shift mode 5 6 7 Audio / Wave-CV In Tune / CV Eff Pit Norm audio signal sampling frequency In pitch shift mode the audio input signal is sampled and played back at the audio output with shifted pitch/ tuning.
System A - 100 doepfer • Freeze option 5 6 7 Audio / Wave-CV In Tune / CV Eff Del, Rev, Pit Frz. audio signal sampling frequency The effect modes delay, reverse delay and pitch shift may also run with the Freeze option. In this case the audio input is no longer sampled and the memory data no longer overwritten. Instead, the frozen memory data are played back. The parameters memory length (Len) and sampling frequency determine the effect.
A-112 Sampler System A - 100 right (cw position 10) it corresponds to the whole memory (64 kbyte or 256 pages). During the adjustment of Len with the tune control no external voltage should be applied to the CV input ". Gate = high: As soon as the gate goes high the current position of the tune control is used to set the Len value. For the different effect modes the following notes also apply: 4. In / Outputs ! Audio In / Wave-CV In At this socket the audio input signal is patched in (i.e.
System A - 100 doepfer H The gate signal applied to this socket is internally connected with the signal coming from the button 4. If either of these is high, the module gate is high. Gate In § high high low low Man. Trig. 7 high low high low result. Gate high high high low $ Audio Out Socket $ is the audio output of the A-112. H The audio signal from the DAC passes a simple low-pass filter to suppress the sampling frequency.
A-112 Sampler System A - 100 F0 00 20 20 Doepfer SysEx-ID 7D < Wave-Nr., Bit 7 - 1 > < Wave-Nr., Bit 0 > F7 As the data range in a SysEx message is 0...127 (7 bit) the wave number requires 2 bytes. Example: Dump of wave no. 201 ("11001001"): F0 00 20 20 7D 64 01 F7 5. User Examples The obvious application of the A-112 is the sampling and playback of external sounds or sounds generated with other A-100 modules.
doepfer System A - 100 The control voltage range 0...+5V corresponds to the 256 tables (0V = table no. 1, +5V = table no. 256). To move from one table to the next one a voltage difference of about 0.02 V (5V/256) is required. Example: To sweep with an LFO (Triangle output) through 64 tables starting with table no. 96 (i.e. passing through the tables 64...128) the following conditions are required: An offset voltage of 96*5V/256 = 1.875V and an attenuation of the LFO signal to 64*5V/ 256 = 1.
A-112 Sampler System A - 100 doepfer Wavetable playback of a normal sample Suggestions for sound experiments: Very interesting sounds can be obtained if a normal sample is played back in wavetable mode - especially if human voice is recorded. During normal sample playback the sample length depends upon pitch and the so-called Mickey Mouse effect occurs. • If the slope of the voltage controlling the wavetable is running backwards (e.g.
System A - 100 doepfer Sampler A-112 Cloc k A-155 1 2 3 4 5 6 7 8 Trig. 1 VC-ADSR Clock CV D Gat e Po st Out 1 S & H Ctrl. 1 Wave- CV In A-112 Po st Out 2 VCF VCA S & H Ctrl. 2 0V LFO Ret rig. In 0V A-130 +5 V A-129 /3 Atten. Off set 00 fig.
A-112 Sampler System A - 100 6. A-112 Sample Dump Loader The A-112 MIDI interface enables the transfer of sample and wave data from and to the device using MIDI SysEx strings. For that purpose a standard MIDI sequencer may be used. In addition we include a 3 1/2“ floppy disk containing a A-112 sample dump loader software for PC. Version 1.2 of this software (see fig. 7) enables bidirectional transfer between A-112 and the PC. Samples and waves can be organized and stored on the storage device (e.g.
doepfer System A - 100 Sampler A-112 fig.
A-112 Sampler System A - 100 doepfer 7. 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. A-112 SAMPLER VC Sampler / Wavetable Osc. S1 Eff Dmp Play MIDI Out Rec Pit Del Rev Loop Wav Make multiple copies of your composite diagram, to use for remembering good patches and set-ups.
