MATRIXSYNTH: One-of-a-Kind Mechanical and Doepfer Based Eurorack Sequencer



Sunday, August 18, 2024

One-of-a-Kind Mechanical and Doepfer Based Eurorack Sequencer

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First video:
Patching my picture reader into my eurorack system
Moog grandmother for bass
Moog dfam for percussion and noises
Tiptop 909 kick, clap, cymbals, hats, one
Polyvoks vcfs
Serge 1973 vcf pinging


via this listing

"A one of a kind Eurorack sequencer and case ( 3 x 126HP).

This case was painstainkling crafted from aluminium extrusuions and 6mm hoop pine plywood. It has removable aluminium legs at the rear that posistion the case on an ergonomic angle.

Inside the bottom of the case the 'clock' is mounted. The clock consists of a geared stepper motor 5:1 driving an aluminium arm with magnets. These activate reed switched on the four different time tracks on the custom made circuit board, 4/4,5/4,6/4,7/4, over 8 bars. The stepper motor is driven by a stepper motor controller, this is connected to a panel installed in the lower left position of the eurorack. This panel has an input 2.1mm barrel socket for a 12V (1A Min) supply, a enable switch, a pulse switch and a direction switch, there is a 3.5mm socket for the input pulse from the oscillator; (the frequency division of the oscillator can be adjusted by dip switches on the stepper motor controller). The oscilator I used was a Doepfer A-145-1 LFO set to High range.

The time signatures are then available over 14 'channels' to have each step turned on or off by the array of miniture toggle switch on the control panel over the 8 bars. The ouputs of each channel are available on 3.5mm sockets on the output panel mounted center-top on the eurorack rails. This panel also features the following outputs - 1 every 8 Bars, Kick drum 4/4, Off beat, 2,4 and 2,3,4 on 4/4 time. Also direct outputs for each time signature.

The case also comes with a custion beat counter module, this displays the BPM in binary.

A selection of spare parts is provided, including - a stepper motor and gearbox (high precision) reed switches, toggle switches, diodes.

Note - this device best suits those with some electronic skills as this device will likely need servicing at some stage. Also it my require trouble shooting should it become damaged during transportation. It will be well packed and marked fragile. The damage will like be a solder joint becoming faulty it the device is bashed about. The circuits are very simple and easy to trace. The 'clock' board is mounted to the botem panel that can be 'quickly' removed from the bottom of the case via wingnuts."

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