MATRIXSYNTH

MOTM-320 Voltage-Controlled LFO

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'The MOTM-320 is a full-featured Voltage-Controlled Low-Frequency Oscillator (VC LFO). Unlike the crude LFOs found in most synths, the MOTM-320 has 4 individual outputs plus a master SHAPE control. This control voltage will shift the shapes of the Pulse, Sine, and Saw outputs in unison. Both 1 volt/octave (temperature compensated!) and variable FM (through a reversing attenuator to go up or down) inputs are available.

Another unique feature is a SYNC input: a positive voltage will reset all 4 waveforms. You can sync to just about any waveform: from another LFO to EG's.

The MOTM-320 is not your standard cheap LFO: it has a full-blown VCO core with discrete waveshaping based on the Moog modular and the VCS3! The core has an astounding frequency range of 1 cycle in 30 minutes to about 2800Hz. A bi-color LED flashes at the LFO rate, and can be set with a jumper to indicate 4 different ways!

Don't sacrifice a VCO as a full-featured LFO: get the MOTM-320 and let the modulations begin!'"

MOTM-101 Noise/Sample and Hold

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"MOTM-101 Description

'The MOTM-101 is an essential part of any synthesizer system. It is a dual-function module, where the Noise Generator is linked to the Sample/Hold section without the use of patchcords. Each section can operate independent of the other.

NOISE GENERATOR

The Noise Generator uses 2 Zener diodes to create White Noise. This White noise contains spectral harmonics from near DC to well above hearing. This type of noise is useful for simulating cymbals, ocean waves, static, and other types of "nature" sounds. It is also useful in generating random signals into the Sample & Hold, and for aperiodic, high-speed clocking.

The White Noise is low-pass filtered at approx. 2500Hz to create Pink Noise. Pink Noise is useful for lower frequency sounds such as thunder. The Pink Noise is filtered even more to generate Random Output, which can randomly modulate filters and VCOs.

These three types of noise are found on many synthesizers. However, look closely and you will see the jack labeled VIBRATO, and its associated control pot! This is a MOTM exclusive: a high-Q bandpass filter (the panel control controls the Q) that generates sine waves centered around 7Hz of random amplitudes (and slightly varying frequencies as well). On the panel, a switch selects driving the bandpass filter with either white noise or the internal/external clock from the Sample & Hold section. When the panel switch selects white noise, the vibrato output is a 'wandering' sine wave, perfect for adding realistic vibrato and tremelo. If the switch is in the clock position, each time the clock cycles the output filter rings in a dampened sine wave (the ringing amount set by the panel control). When fed to a VCO, the VCO makes a unique "bbbooooiiinnngggggg" sound.

SAMPLE & HOLD

A Sample & Hold circuit is a sort of voltage memory: each time the clock generator cycles, the signal on the INPUT jack is captured and stored on a special capacitor. This voltage is buffered and fed to the OUTPUT jack. Even with many seconds between samples, the output voltage remains nearly constant (since no circuit is perfect, the output voltage will droop, but at a miniscule rate on the order of 1mv per second). The MOTM-101 contains an internal clock oscillator, whose speed is set by the panel control. A red LED flashes at the clock rate. Plugging another clock source (VCO, LFO, etc) into the EXTERNAL jack over-rides the internal oscillator.

Again, a Sample & Hold is a part of all synthesizers....but wait! Hmmmm...what's that switch marked Track/Hold? Another MOTM exclusive! In the HOLD position, the circuit acts like a "normal" S/H: the output is held steady at the start of each clock cycle. But, in the TRACK position, the output follows (tracks) the input when the clock is low (less than 1.5 volts) and holds the output when the clock is above 1.5 volts. If you are familar with TTL digital logic, this mode is referred to as a 'transparent latch'. From a musical standpoint, this can generate more unique sounds than other S/H modules.

The SLEW control adds portamento or glide to the S&H output. It can be adjusted from zero to 10 seconds.'"

Clavia Nord Lead 2x Rack

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Roland Jupiter-6 Analog Synth Synthesizer w Europa

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Roland TR-606 Drumatix w/ Original Case

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"The unit was recently serviced locally at SV Synthesis. This listing includes the TR-606 and the original case."

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Roland TB-303 w/ Original Case

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"The unit was recently serviced locally at SV Synthesis. You can can read about the service done and hear a sound sample of the unit here"

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Vintage ELKA OMB 5 SN 037200

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Note this is digital.
"# This is the Elka OMB (One Man Band) 5 Synthesizer keyboard.
# It comes with 2 really cool pedals -- the OMB 5 pedalboard bass pedal and the VP 5B Volume Pedal with Start/Stop and Chord Controls as well as the PG105 (PG-5) Push Button Switch for Fill In on/off controls
# This is authentic vintage, probably 1970s.
# The coolest thing about this synthesizer is the MIDI in/out -- you can actually hook it up to your computer and record vintage sounds"

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