Synthrotek MST System 84


“If you want a fully modular “traditional” synth, then this Synthrotek system has got you covered. This is a dual vco, dual vca, dual envelope monster complete with filter, mixer, delay, multiple, sample & hold, and an lfo, all neatly packed into a sexy 84hp skiff boat.

Once again, Synthrotek has put together a system that you can hit the ground running with, and of course since it’s modular you’re free to swap out parts, or add onto it as you go along….or not, it’s totally up to you!”

Special Order - Please allow 7 to 10 days for delivery

Housed in Synthrotek’s 84HP Skiff Boat, the MST SYSTEM 84 is a very powerful analog monophonic FULLY modular synthesizer. Includes a power brick and a 20-pack of patch cables.

Modules Included:

MST MIDI to CV Converter

The MST MIDI to CV Converter is a translator between digital devices and analog synths, allowing you to connect your modular system to a keyboard, computer, phone or tablet.

MST ’07 Buffered Multiple

The MST ’07 Buffered Multiple is a PRECISION buffered mult that is perfect for for 1V/O CV sources. A signal plugged into Input 1 will be available from all 14 outputs. Break the chain by adding a second signal into input 2; signal 1 comes out 4 outputs and signal 2 is available at the remaining 10. Plug in as many as 4 inputs, each split 3 or 4 times. What you put in you get out!


MST Voltage Controlled Low Frequency Oscillator is another tiny, useful module packed to the gills with features.  Manual and CV control over rate with 3 discrete waveform outputs.  A square wave can be used to clock modules such as our Noise, Sample & Hold module. Great for creating vibrato, tremolo or other classic modulation techniques.  Great for frequency modulation, especially when connected to the MST analog VCO.

MST Noise Sample and Hold / Track and Hold

The MST Noise/ Sample & Hold / Track & Hold Module supplies you with all the noise and random goodness you need in one small 4HP package.  White, pink, and slow-random noise are just a patch away.  The white noise is normalled to the signal input or input your signal of choice and break the normalled connection.   To activate either the S&H or T&H, just supply the module with your clock source to start generating stepped random control voltages.

MST VCO (x 2)

The MST VCO is a 100% analog 6-octave 1V/O trackable precision oscillator with full pulse width and modulation controls and with 5 waveform outputs.

MST 4-Channel Audio/CV Mixer

The MST Audio/CV 4-Channel Mixer is a mixer and/or attenuator with mute switches per channel A must for the performing modular artist!

MST Low Pass Filter

The MST Low Pass Filter is a precision analog dual slope output 2 & 4 pole filter. Simultaneous -12 DB and -24 DB outputs with CV control over all parameters. Can be used as a 1V/O sine wave oscillator

MST Dual Envelope

The MST Dual Envelope is a simple-to-use yet complex dual envelope generator.  Channels 1 and 2 are both normalled to each other to cycle when the other respective channel hits end of cycle, allowing for really interesting ping-pong effects.  Each channel also has an end-of-cycle trigger output with LED indicator.  Thereís a normal and inverted envelope out.  The inverted envelope out can be further modified by the +5 offset switch, which allows the inverted waveform to travel in the positive.  The + output level allows the envelope signal to go between zero and the maximum voltage rail.  Attenuate the output level down for a more subtle envelope (adjust to taste).


The MST Dual 2164 VCA is a precision AC (audio) & DC (gate triggers or control voltage) Voltage Controlled Amplifier in 6HP.  Each channel has a linear or exponential response switch, the exponential resulting in a ìpoppierî response.  Adjustable output level and bleed if you want to mix in your unaffected source audio.  Butters your toast all the way to the edge.

DLY Module

The Synthrotek DLY is a PT2399 bucket-brigade style delay Eurorack module.  The PT2399 IC delivers lush analog-sounding tones (the IC is partially digital). The DLY is similar in tone to our ECHO Eurorack module, but its features make it unique in its own right.

Unlike the ECHO which always has a wet signal (i.e. the echo effect is always mixed in with the input), the DLY offers a true wet/dry Mix knob.  When the Mix knob is fully counter-clockwise, you get a dry signal. When it is fully clockwise, you get a fully wet signal.  This allows the user to incorporate this module into effects sends, etc. Also, the DLY allows for CV over Feedback and has an internal Feedback amount trimpot for precise adjustment.

Another added feature is the delay Rate range internal trimpot, which allows you to dial in the delay range of your choice. Adjust the trimmer and main Rate knob to dial in clean short slap-backs all the way to the extreme, chaotic sounds of an over-clocked PT2399 chip.

MST Stereo Output Mixer

The 1U Stereo Mixer is intended for pannable stereo output, but it is also suitable for both DC (Gates, Triggers and Control Voltage) & AC (audio) signals. It has 2 channels with 2 inputs per channel

Any hardware that I personally stock will be sent out the same or next business day and should arrive within 3 to 5 business days.  Some products ship directly from the manufacturer or the manufacturer’s warehouse and should arrive in most locations within 5 to 7 business days. Special order eurorack systems, cases, and some modules are built to order by the manufacturer and will arrive within 5 to 14 business days depending on the item.

In every situation I will keep you updated through the entire process and I am always available for questions should any arise.