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Thread: USB MIDI : how to connect Teensy sequencer + Teensy synth + ext Keyboard ?

  1. #1
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    USB MIDI : how to connect Teensy sequencer + Teensy synth + ext Keyboard ?

    Hello,

    I am lost with USB MIDI.
    I have build :
    - a (basic) sequencer with a Teensy LC.
    - a synth with a Teensy 3.6. I have wired the MIDI HOST and it is working.

    I don't know how to connect these devices together and which port to use. For exemple, how would you connect :
    - my T3.6 synth + my T LC sequencer + an external USB MIDI keyboard (no computer)

    Generally speaking how do you connect multiple Teensy MIDI devices together ? Do I have to care about "master mode" and "host mode" ?
    Sorry for this basic question but it is not clear for me.

    Emmanuel

  2. #2
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    Connect your sequencer and your keyboard to a USB hub (I would use a powered hub, if you have one) then connect your hub to the MIDI host port on your Teensy synth.

  3. #3
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    Thank you !

    Another question : is it possible to connect directly my sequencer (T-LC) into a T3.2 synth, using a micro USB <--> micro USB cable ?
    I don't have such a cable for the moment...
    Emmanuel

  4. #4
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    micro USB vs. USB host connections & capabilities

    Quote Originally Posted by emmanuel63 View Post
    Thank you !

    Another question : is it possible to connect directly my sequencer (T-LC) into a T3.2 synth, using a micro USB <--> micro USB cable ?
    I don't have such a cable for the moment...
    Emmanuel
    Emmanuel (emmanuel63):

    I don't think that will work. All USB operations depend upon a "USB host" recognizing, initializing, & communicating with a "USB device". With your proposed "micro USB <--> micro USB" you would have two USB devices, but no USB host. Take a look at <this> thread for discussions on the different capabilities & different scenarios between using the Teensy micro USB interface for MIDI & using the Teensy USB host for MIDI. Hopefully this will make it clearer. I would expect that you would still want to connect your T-LC sequencer into the USB host port on your synth. Note that I have not used a T3.2 specifically, but taking a quick look, I don't believe that it has a USB host interface...I have only used the T4.x, which has both micro USB & USB host. You might consider using the T4.x for your synth.

    Mark J Culross
    KD5RXT

  5. #5
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    Thanks for making it clear !
    I have tested a micro USB <--> micro USB connection : it fails. So yes, you definitely need a HOST USB port.
    Emmanuel

  6. #6
    Senior Member
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    If you want the TeensyLC sequencer to make the T3.2 Synth sing you could use Serial.

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