VM2500 Blank Panel Module 1001 VM2500 Dual Envelope Generator Module 1003 VM2500 Oscillator Module 1004-P VM2500 Oscillator Module 1004-R VM2500 Oscillator Module 1004-T VM2500 Modamp Module 1005 VM2500 Filtamp Module 1006 VM2500 Dual Noise/Random Voltage Generator Module 1016 VM2500 Oscilloscope Module 1019 VM2500 Dual Oscillator Module 1023 VM2500 Dual Reverberator Module 1025 VM2500 Preset Voltage Module 1026 VM2500 Clocked Sequential Control Module 1027 VM2500 Dual Envelope Generator Module 1033 VM2500 Sample & Hold Module 1036 VM2500 Triple VCA Module 1042 VM2500 Synthesizer Voice Module 1045 VM2500 Quad Envelope Generator Module 1046 VM2500 Multimode Filter Resonator Module 1047 VM2500 Mix-Sequencer Module 1050 VM2500 Dual Four-Channel Mixer Module 1051 VM901 Voltage Controlled Oscillator VM902 Amplifier VM903 Random Signal Generator VM905 Reverb VM907A Fixed Filter Bank VM911-A Dual Trigger Delay VM912 Envelope Follower VM921 Voltage Controlled Oscillator VM923 Filters/Noise VM927 Multiple VM958 Keyboard/VCO Interface VM960 Sequencer VM962 Sequential Switch VM984 Four-Channel Matrix Mixer VM995 Attenuators VM914 Fixed Filter Bank VM928 Sample Hold VM1630 Frequency Shifter VM901ABBB Voltage Controlled Oscillator VM904A/B/C Filters VM911 Envelope Generator VM921ABBB Oscillator Bank VM Rackmode 10 Band Graphic EQ VM Rackmode 12 Stage Phaser VM Rackmode 3 Band Parametric EQ VM Rackmode Poly Vocal Source Oscillator VM Rackmode Ring Modulator VM Rackmode String Filter VM Rackmode Vocal Source Oscillator VM Rackmode Frequency Shifter VM Rackmode 16 Channel Vocoder VM Miniverse A-440 VM Miniverse Contour VM Miniverse Filter VM Miniverse Glide VM Miniverse Mixer VM Miniverse Noise VM Miniverse Oscillator VM Miniverse Poly Contour VM Miniverse Poly Filter VM Miniverse Poly Glide VM Miniverse Poly Mixer VM Miniverse Poly Oscillator VM Miniverse Poly VCA VM Miniverse VCA

The 1036 Sample & Hold Random Voltage module is a synthesis tool that repetitively “samples” an input signal and outputs its voltage until triggered again. This module features two identical sample & holds and includes a built-in white noise generator - the most common "sample" source for creating random voltages. It also includes two independent clock sources - both sample & holds can run from one clock or they can run independently. The original 1036 module also features and extensive front-panel circuit schematic, which is helpful, should it ever need servicing...

Kidding aside, we've illustrated how a sample & hold works to make its operation easier to understand. In the image below, the smooth gray line shows a continuous input signal. Each time the module is triggered the current voltage is “sampled” and “held” until the next trigger. The red line shows the stepped output signal.

Inputs, Outputs, and Controls

Clock Freq- The clock "samples" the incoming signal at intervals defined by its current setting. Its range is from 0.1 Hz - 1000 Hz (depending on the current Clock Multiplier slide switch setting).

Clock Multiplier Switch- Center position is nominal; moving the switch left divides clock frequency by 10, moving it to the right multiplies clock frequency by 10.

Clock Frequency Mod CV jack and attenuator- Allows CV control of the clock frequency. The attenuator is bipolar with center position = no modulation.

The Sampling Switch

If you're familiar with circuit schematics, you probably recognize this as the symbol for a switch. This represents the "sampling" the input voltage. Looking at the panel, we see three arrows around its perimeter - each of these represents a way the switch circuit can be triggered, via either the momentary Single Sample button, the onboard clocks, or the Sample In jack. Note that all three trigger inputs are simultaneously active.

Single Sample button- This momentary button "grabs" an instantaneous sample of the input signal - either white noise (if the Int Random Sig knob is up) or from a source patched to the Ext Sig input jack.

Clock (a) and Clock (b)- The two independent onboard clocks are used to sample input signals at regular intervals. When disabled (toggles in Off position, duh), new sample voltages are output by clicking the Single Sample button. Sample & hold B (the one on the right) can be clocked with clock (a) (both sample & holds synchronized) or clock (b) (each sample & hold running independently), or both clock (a) and clock (b) simultaneously for all manner of asynchronous sample & hold clockin' fun.

Sample In jack and Trig/Gate switch- The Sample In jack triggers sampling when it receives a CV. In Trig mode a single instantaneous sample is taken when a trigger or gate voltage is received.

In Gate mode, the sample switch is held closed as long as a gate signal is present - the audible result is that the sample and hold output "follows" the Int Random Sig (i.e. onboard white noise) and/or the Ext Sig input, until the gate voltage falls, at which time the latest value is held. This is called "track and hold".

Int Random Sig jack and attenuator- Sets the level of the internal white noise sample source. White noise is frequently used as a source in sample & holds because the resulting voltages will be completely random. The attenuator sets the amount of white noise routed to the sample & hold circuit.

Ext Sig input jack and attenuator- Allows any signal to be used as a source to be sampled. Interesting results can be achieved with any the standard "rising" or "falling" oscillator waves at sub-audio speeds (i.e. ramp, saw, triangle, or sine waves). Endless semi-melodic permutations can be created by varying the frequency of the waveform in combination with the sample & hold clock speed. The attenuator knobs sets the amount of external signal routed to the sample & hold circuit.

Note that the onboard white noise signal and external signals can be combined.

Clock Out- An output for the internal clock circuit for syncing to other modules.

S/H Out- Output voltage of the sample and hold circuit.