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MIDIbox Chaos Matrix Manual

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2018/10/26 09:28
Chaos Matrix
Introduction
Chaos Matrix is a programmer for an Oberheim Matrix 1000 analog synthesizer built by
Manderson. It's capable of manipulating all 126 voice parameters including 10 programmable matrix
modulations buses, ramp generators, 5 point tracking generator, 3 five stage envelopes, 2 oscillators,
2 LFOs, and much more.
It features edit buffer synchronization for visual feedback and inspection of all Matrix 1000 voices
parameters, patch compare, patch init, advanced performance options for some parameters as well
as containing all 1000 original patch names. Seeing patch names instead of numbers alone, makes it
a lot easier to remember your favorites.
Chaos Matrix was completed in March 2010 after installing the MIDI Merger unit, and building a rear
panel with jacks power plug and switch. It was built with help from the MBHP (MidiBox Hardware
Project) using the MIOS operating system. It uses 1 DIN module, 1 AIN module, 1 DOUT module and 1
core with a PIC18F4620 microprocessor along with a custom application built with the C skeleton
interface. The internals of a MIDI-MAN MIDI Merger 2×2 were used to provide the 2 MIDI input
merging.
Forum announcement here:
MIDIbox - http://wiki.midibox.org/
Choas MAtrix Announcement
1/11
Chaos Matrix
Patrick

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Summary of Contents for MIDIbox Chaos Matrix

  • Page 1 Chaos Matrix was completed in March 2010 after installing the MIDI Merger unit, and building a rear panel with jacks power plug and switch. It was built with help from the MBHP (MidiBox Hardware Project) using the MIOS operating system.
  • Page 2 Last update: 2016/06/27 21:18 chaos_matrix http://wiki.midibox.org/doku.php?id=chaos_matrix Video Video http://wiki.midibox.org/ Printed on 2018/10/26 09:28...
  • Page 3 How-To Build document still needs more content Features Almost all communication from the Chaos Matrix to the M1000 is made via MIDI system exclusive messages. Non-registered parameter numbers were not implemented in the Matrix 1000 firmware despite what the manual states. Some communication from the M1000 to the Chaos Matrix is necessary however.
  • Page 4 However, each and every patch name (published when the M1000 was released) was painstakingly included in the Chaos Matrix firmware and is displayed while browsing patches. Seeing patch names on the LCD instead of numbers alone, makes it a lot easier to remember your favorites.

  • Page 5: Panel Design

    2018/10/26 09:28 5/11 Chaos Matrix 1000 with a dedicated control for every parameter. Unfortunately there was a physical limit to the number of analog and digital inputs I could use with one core. So I compromised by layering groups together, like the DCO, LFO and ENV controls with select buttons.
  • Page 6 Last update: 2016/06/27 21:18 chaos_matrix http://wiki.midibox.org/doku.php?id=chaos_matrix The redesign of the panel began with inspiration from a few classic analog synths: The panel to the Oberheim OBX, Roland Jupiter 8 and Jupiter 6. I liked how simple the two rows of controls were laid out on the Jupiter 8 and how easy it was to see the flow of synth parameters.
  • Page 7 2018/10/26 09:28 7/11 Chaos Matrix prototype originally used potentiometers but I found it difficult to dial in an exact frequency. I decided to use detented encoders instead. Pulse waveform can be enabled by toggling the pulse button and altering its shape with the “Width”...
  • Page 8 You want to maximize the contact between the screw and aluminum surface. Allow another 24 hours to cure. How to build a Chaos Matrix I realize some people may not want to build theirs using the same panel layout, same pots, buttons encoders etc, but I'll document my construction as much as possible so it can be used as a reference for those who want to build their own custom programmers for the Oberheim Matrix 1000.
  • Page 9 Chaos Matrix Building the Modules Follow the standard instructions for building the 4 Midibox components and getting them connected to the core. You will also have to build a cable to connect the core to the character LCD module. I would highly recommend getting PCB kits from avishowtech.com...
  • Page 10 Last update: 2016/06/27 21:18 chaos_matrix http://wiki.midibox.org/doku.php?id=chaos_matrix Finally, clamp the remaining unused AIN pins to ground. The Mountain Switch buttons can be mounted on a small PCB. 2 of its pins are for the button, the other two are for the LED.
  • Page 11 2018/10/26 09:28 11/11 Chaos Matrix From: http://wiki.midibox.org/ - MIDIbox Permanent link: http://wiki.midibox.org/doku.php?id=chaos_matrix Last update: 2016/06/27 21:18 MIDIbox - http://wiki.midibox.org/...