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Oakley midiDAC User Manual

Single channel midicv converter
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Oakley Sound Systems
5U Oakley Modular Series
midiDAC
Single Channel midiCV Converter
PCB Issue 4 & 5
User Manual
V5.0
Tony Allgood
Oakley Sound Systems
Carlisle
United Kingdom

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Summary of Contents for Oakley midiDAC

  • Page 1 Oakley Sound Systems 5U Oakley Modular Series midiDAC Single Channel midiCV Converter PCB Issue 4 & 5 User Manual V5.0 Tony Allgood Oakley Sound Systems Carlisle United Kingdom...
  • Page 2 The suggested front panel layout for the 2U wide MOTM format module.
  • Page 3 Introduction This is the User Manual for the issue 4 and 5 midiDAC midi to CV convertor 5U module from Oakley Sound. This document contains an overview of the operation of the unit, the midiDAC PIC specifications and the calibration procedure.
  • Page 4 Slide may be turned off by transmitting the standard midi glide/slide command. Also featured on the circuit board itself is a 3-way header to directly feed the Oakley ‘CV- gate’ bus on the Dizzy board.

  • Page 5: Other Features

    The new suggested panel layout incorporates both the glide and re-trigger switches. The midiDAC features a built in midi THRU port. This essentially produces a copy of the midi input signal which can be then fed to another midi unit. Both the opto isolator and the THRU buffer are high speed devices so there is minimal skew.
  • Page 6 A third logic output is also available from the PIC that can drive a midi active LED and suitable current limiting resistor. This feature is unused in the midiDAC module. This output goes low for 500mS if any valid midi data is present on the midi port.
  • Page 7 1010 1011 1100 1101 1110 1111 For example, to set midi channel 3, set the DIP switch to 0010. That is, 1 on, 2 off, 3 on, 4 on. This midiDAC is set to receive midi data on channel 3...
  • Page 8 TB303 slides. Legato Mode may also be enabled or disabled via the Legato Footswitch MIDI messages. If these messages are to be used, the Slide Mode switch on the midiDAC unit should remain in the off position. midiDAC Implementation of MIDI Controllers The following table summarises the MIDI controllers supported by the midiDAC firmware.
  • Page 9 Note Priority The midiDAC firmware uses last note priority. That is, it will assign the pitch CV to the last note to be held. However, all 'overlapped' notes are still retained in memory and are reactivated in order should the most recent notes to be held be released.
  • Page 10 There are two trimmers, V/OCT and INIT, on the midiDAC PCB. Both of them are designed to allow you to make the midiDAC respond correctly to the rest of the modular system. If you already have a perfectly tuned and calibrated system, it is best to trim the midiDAC to suit your system rather than the other way around.

  • Page 11: Final Comments

    VCOs produce the correct note when played from a keyboard or sequencer. If you have an issue 5 midiDAC with R2 installed then INIT is normally adjusted so that the Pitch CV output produces 0.000V when a C2 note (midi note number 36) has been sent to the module.