modular analog synthesizer for electronic music
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 Q174  MIDI Interface

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The Q174 MIDI Interface module accepts MIDI data from a keyboard, computer or other device and produces Pitch, Gate and other signals needed to control the synthesizer.

Three modes of operation offer a variety of outputs for one or two MIDI channels. Outputs include standard 1V/Octave Pitch outputs with 10-octave ranges, 5V Gates, Trigger pulse, On and Off Velocity, Channel Pressure and several Continuous Controller outputs.

Complete control over Note Priority and Gate modes provide virtually any type of keyboard response emulating virtually all vintage and modern keyboards along with some that are unique.

Q175 MIDI Interface aid Add an Arpeggiator, Portamento, MIDI Thru and a MIDI Merge input to your Q174 module with the Q175 MIDI Interface Aid module.

Controls and Connectors

    Q174 MIDI Interface usage
    MIDI Input
      MIDI input. Channel is jumper-selectable to 1,3,5 or 7.

    Pitch Output

      Pitch voltage output. 1V/Octave scaling. 10-Octave range. This output also responds to pitch bend messages from the MIDI port (+/- 2 semitones).

    Add In Input

      Voltages patched into this input are added to the voltage at the Pitch output. This allows transposing using a sequencer, vibrato from oscillators, merging of other controllers, etc.

    Velocity Output

      Note On Velocity messages produce a voltage at the Velocity Output. The range is 0-5V. This voltage can be used to set amplitude, filter frequence or any voltage-controllable parameter within the synthesizer.

    Gate Output

      Gate output. 5 volt positive. Typically used to control envelope generators are start sequencers. An LED indicates the status of this output.

    Mode Switch

      The mode switch determines the function of the middle three outputs. Regardless of the mode, data from the first MIDI channel produces signals in the top section. Gate and Priority switches are in effect in all modes.

    Mode 1

      Full-featured single-channel operation. The middle three outputs produce Channel Pressure voltage, Off Velocity voltage and a Trigger Pulse.

    Mode 2

      Full-featured single-channel operation. The middle three outputs produce Pitch, Velocity and Gate signals for a second channel (selected channel+1).

    Mode 3

      The middle three outputs produce analog voltages from Continuous Controller Messages #1 and #7, along with an On/Off Gate signal from #4. These can be used to control filters, start sequencers, etc.

    Gate Mode

      Determines how Gate signals are produced when multiple keys are pressed. Single mode produces a new Gate signal only when there is one key being pressed, subsequent overlapping notes do not produce a Gate. Multiple mode produces a new Gate at ever keypress regardless of the number being pressed simultaneously. Mulitple+R mode is like Multiple mode but also produces a new gate when keys are released.

    Note Priority

      Determines how Pitch voltages are created when multiple keys are pressed. Last mode produces a pitch that is the most recent note played. Low mode produces a the lowest being played. High mode produces a the lowest being played.


Panel Size:  Single width 2.125"w x 8.75"h.
Pitch Outputs:  1V/Octave, 10-octave range.
Velocity Outputs:  0-5V.
Gate Outputs:  5V positive.
Trigger Output:  5V positive, 5ms.
Channel Pressure:  0-5V.
MIDI Pitch Bend:  Affects Pitch outputs +/- 2 semitones.
Pitch Add Input:  External voltage added to Pitch.
CC Outputs:  CC1(analog 0-5V), CC7(analog 0-5V), CC4(digital 0-5V).
MIDI Channel #:  Jumper-selectable to 1, 3, 5 or 7.
Gate Modes:  Single, Multiple, Multiple+Release.
Note Priority:  Last, Low, High.
Power:  +15V@30ma, -15V@30ma, +5V@50ma.


Data Sheet
Click Here for data sheet in PDF format.


$264.00 US.


Usage and Patch Tips

This basic patch uses the Q174 as a single-channel MIDI interface to the synthesizer.

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Mode 2 operation allows the Q174 to be used as a dual-channel MIDI interface for synthesizer 2 voices.

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Using Mode 3, the Q174 can produce signals from knobs of a MIDI keyboard to control filter parameters via Continuous Controller Messages.

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Use the Add-In jack to transpose the first keyboard from a second keyboard.

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Feel free to suggest more examples

End of Product Information