The E102 is a 4-tap delay for control voltages (a digital implementation of the Serge ASR – Analog Shift Register). There is also a digital noise generator with 8 different types of noise spectra. With no CV patched into the INPUT jack, the digital noise is sampled. Each clock pulse (internally set by RATE or patched into CLOCK IN) samples the INPUT and stores it as a 14-bit value. Successive clocks then shift the sampled voltage to the next output. The sampled voltage is shifted in the delay line as OUT1 > OUT2 > OUT3 > OUT4. A quad 14-bit DAC drives the outputs with an accuracy of <1mv.
A unique addition to the traditional ASR is the voltage-controlled DELAY. Selectable in 3 ranges, this adds delay stages in-between each output. For example, if DELAY was 2, then it would take 6 additional clocks for the OUT1 to “travel” down the delay line to appear at OUT4. The INPUT is sampled once for each clock, no matter what the DELAY is. The outputs can be quantized to whole-note steps.
The most common use of the E102 is having each OUT drive a VCO. If you have a step sequencer, then use the sequencer’s clock into CLOCK IN and the sequencer’s CV out to INPUT. The 4 OUTs will then generate a musical canon (like “Row Row Row Your Boat”) when driving 4 VCOs. Each VCO will play the same note as the prior clocked output. This is of course assuming DELAY = 1. DELAY is not the same as a ‘clock divider’: when DELAY is not 1 (say it is 12), then every sample clock, the INPUT is fed into the delay.
In this case there are 12 clock-delay stages between each out. If 0.25V was sampled and appears at OUT1, then 12 clocks later that same 0.25V appears at OUT2. There is no delay from INPUT to OUT1. The delays are OUT1 to OUT2, OUT2 to OUT3, and OUT3 to OUT4. OUT1 is a ‘traditional’ sample/hold.
Height 3U (128.5mm)
Width 14hp (70.8mm)
Power 14-pin Eurorack (55mA from +12V, 25mA from -12V)
Out 1-4 Voltages 12Vpp nominal (-6V to +6V, +-1mV accuracy)
Noise Outputs 10Vpp nominal (-5V to +5V)
Input CV Range 12Vpp (-6V to +6V)
Control CV Range 10Vpp (-5V to +5V), DC to 1kHz
Rate Internal sample/shift clock rate (from ~0.5Hz to 925Hz)
Delay knob Number of internal delay stages based on the DELAY switch position
Noise Selects 1 of 8 different types of noise spectra, from Karplus-Strong “pings” to pink noise
Quantize OFF will sample the input to the output. ON adds whole-step quantization to each sample clock. FLOW will ignore the sample clock and not do any shifting. The INPUT is quantized and copied to all 4 outputs. This is the “stand-alone” quantizer mode. 1 whole step = 0.083V
Delay switch Sets the 3 DELAY ranges between the stages (not the total) as follows:
SHORT: 1–8 (1 = 1 clock between stages = delay of zero)
MEDIUM: 1-32 clocks
LONG: 1–511 clocks
INPUTS AND OUTPUTS
Input The CV to be sampled is patched into here. If no patch cord is inserted, the internal digital noise is sampled. The applied CV is sampled at the rising edge of the clock and appears at OUT1.
White Out Fixed-spectra white noise output. Not affected by the NOISE knob or CV input.
Digital Out Digital noise output
Clock Out 0–6.5V square wave, same rate as the internal clock
Rate/Delay/Noise CV Modulates the value set by the corresponding knobs with a -5V to +5V range.
Clock In Any external LFO/VCO can override the internal clock. For best results, use a pulse/square wave or a sine. The external clock must be at least 3Vpp. The upper frequency limit is 3KHz. Exceeding 3KHz may result in erratic behavior with loss of output voltage accuracy. It is possible to sample low-frequency audio (such as envelopes or LFOs).
Out 1 – Out 4 The 4 CV outputs of the sampled INPUT. Each output can be thought of as a ‘tap’ in a delay line, which can vary from a length of 4 (1-stage delay, the minimum setting) to 1533 (3×511).