MC-2oh2

This project is still in development. If you would like to get a notification when it is available, please contact us.

MC-2oh2 is an upgrade for the Roland MC-202 synthesizer / composer.

Feature list

This list is far from complete and I will add to it when questions arise or changes are being made.

All pictures were taken during development, features and look may change.

Sequencer:
———–

The new sequencer is similar to the 1oh1 sequencer, with some features added.
We might include a sequencer mode that is more like the original, but for now focus on a step-based approach.

  • Step based. Clock divider can be set to 16th, 8th, 3/16th, …
  • Note lengths are fixed, but you can select different gate lengths.
  • Each note can also have the following attributes:
      • Accent
      • Filter Accent
      • Noise Accent (see below)
      • Portamento
      • 4 different lengths
      • Portamento on same pitched notes creates longer notes..
      • Any combination of the above
      • Rest
    • The pattern editor can delete notes and insert new notes
    • Patterns can play forward, backward, ping pong and random
    • You can program up to 32 patterns, each up to 64 notes long
    • Patterns can be copied and edited
    • Patterns can be chained to a song. Songs can be programmed live, even while an other song is playing.
    • Each of the three channels (A,B and drums) has its own independent sequencer, patterns and songs. You can start, stop and edit each channel independently. Of course patterns can have different lengths, so polyrythms are possible. But you can also use this to have e.g. a 16 note melody and 64 note baseline.
    • Each channel has its own clock divider, one channel can be clocked in 16th steps, another in 3/8ths,..
    • Sequencer data can be saved in EEPROM and recalled. Different ‘sets’ are possible.
    • When playing sequences, you can also add modifiers (Accent, etc.) live
      Song/Pattern start synced to bar start

Playing
——-

  • You can play on the internal keyboard, via midi or via external CV/Gate.
  • You can add modifiers (accent, etc) when playing as well
  • Internal keyboard can be transposes up and down to cover the whole 5 octave range

Analog
——-

  • Additional noise waveform triggerable in the sequencer
  • additional Filter LFO, ADSR and ACCENT
  • midi filter control
  • LFO, ADSR and midi control for PW (pulse width)
  • Software controlled direct CV (routes CV-in to the VCO directly)
  • Tape in is trigger input
  • Optional support for microtuning via an

Midi
——

  • Midi in and out using the existing DIN-connectors
  • DIN in and out function remains
  • Sysex dump of sequencer data
  • control: filter cutoff, pw, additional LFOs and ADSRs, accent parameters, etc.
  • Midi note on/off (obviously)
  • Midi clock input
  • Midi output on different channels supports sequencer notes, as well as a channel for the internal keyboard)

Clock
—–

  • Clock sources: DIN-Sync, Midi-Sync trigger
  • Conversion from midi to din and din to midi
  • master and slave modes with bpm detection

Display
——
An optional OLED display replacement will be offered. The display module replaces the button pcb and also has the advantage of better button behavior. The original button board creates ‘ghost presses’ if more than 2 buttons are pressed, this is not an issue with the new board.

The OLED displays a lot more info than the LCD could ever do. Pattern lengths, song lengths and positions and so on. You can see this in the videos posted above.

Installation
———–
MC-2oh2 replaces the original CPU. This is a 1mm pitch SMD chip. Replacing it requires some SMD skill and tools, but is surprisingly simple. We will provide detailed instructions and a video. Most synths techs will be able to do this and we will arrange a list of qualified techs around the world.

FAQ:

Q: I have a couple of mods done to my 202, will they interfere with the mod?
A: Usually these modifications are purely analogue and will not interfere with the mod, however there might be exceptions, such as the case below.
The following mods should not cause any issues:
– Extra CV-inputs such as: Filter, PW, VCA, MOD, …
– Extra audio input for the filter or similar
– Extra outputs: Such as waveforms
– Extra modulation (Filter modulation for example)
– LFO speed mods, accent trigger, etc…

Q: My 202 has the the ‘direct CV-in’, does this interfere with the mod?
A: This depends on how this mod was done. Can you switch the direct CV on and off? Then you don’t need to worry. If however the external CV is hardwired to the VCO, completely severing the connection to the CPU, it does not have any control. You would not be able to use the sequencer.
In such a case you’d need to reverse this modification or change it into a switchable type.
Rule of thump: if you can use your 202’s sequencer, all is fine.

Q: How does the 2oh2 mod respond to external CV? Is there the same kind of lag as in the original?
A: MC-2oh2 offers two CV-in modes which are selectable in software:
– True direct CV-mode. CV-in is directly passed to the VCO. CPU, does not have any control over the pitch
– Quantized mode: CV-in is read via an ADC (analog to digital converter), quantized and then passed to a DAC (digital to analog converter). However by using a different ADC, MC-2oh2 can do this much faster then the original. There is no significant lag.