Syncing plus usb keyboard control...

edited July 31 in Help

Hi all,
I just finished figuring out how to use my op-1 as the master and now my two volca’s and two pocket operators are all in sync. Yay!
But, what if I also want to attach a usb keyboard like the Arturia keystep instead of using the op-1 keyboard in this rig? Doable? How?


  • Definitely doable! You would be needing a MIDI host. Which one? You'll have to dig here.

    I use this one because my controller only has USB MIDI.

  • I guess you're using PO Sync mode on your OP 1 metronome page to sync your Volcas?
    If so try attaching the sync to the keystep trigger in, then use a standard midi cable from keystep to first Volca.
    No need for a usb host then.

  • @pianobar How do you use the USB host mini?

  • @SOMAtic I soldered two of them point by point and added another USB port for powering it.

    Now I can play the OP-1's sounds with my Yamaha P-45 (Digital piano).

    I'll try to find the time to make a short video of it, will be posting it in a new thread any time soon.

  • edited August 8

    @pianobar interesting! would be quite easy to add a LIPO battery to it

    wonder if u could use one of the hosts and plug in like a USB to MIDI DIN kinda thing for flexibility when u wanted DIN I/O jacks.
    that would be something

  • @docshermsticks that's exactly my next step! Only I currently don't have any MIDI DIN device, but as soon as I get my Arturia Beatstep I'll give it a try.

  • @pianobar nice! in theory it seems like it would work since its a host
    & as long as the DIN device was class compliant.

    i might scoop a couple of these. they aren't too expensive.
    did u have to hook up all the connections or just the power, ground, rx and tx?

  • ya just remembered that the euro is favorable to the us dollar right now
    ordered a few to mess around w/
    should be fun!

  • @docshermsticks just power, ground, rx and tx. Cool thing you pulled the trigger, shipping was super fast for me (even though I live in Mexico).

  • @pianobar nice thanks man! should be a fun lil project.
    i've got some empty SNES game carts that might be perfect for this
    we shall see tho

  • @pianobar can these pull their power from the USB host port (the OP-1) so as not to need an external power supply?

  • @Sparky No they can't. The only scenario where I didn't need an external power supply was when I (pointlessly) connected it to my laptop.

  • dang u weren't kidding already in NYC customs

  • @docshermsticks (stuck behind a box of 150 OP-Zs !) ;-)

  • lol maybe they'll mix it up and i'll get one by accident

  • are there any ways to eliminate hiss when connecting OP-1 via usb?

  • if turning off usb charging doesn't work then
    try a ground loop isolator they are cheap & did the trick for me

  • edited August 16

    @pianobar just got my boards hooked em up real quick
    totally works w/ a usb to din midi adapter!
    using a iconnect mio

    thanks much!

  • @docshermsticks Nice. Thanks for the info!

  • edited September 1

    @pianobar anytime man
    now i just gotta wait for the enclosure, lipo battery and battery board
    put it all together

  • @docshermsticks said:
    @pianobar just got my boards hooked em up real quick
    totally works w/ a usb to din midi adapter!
    using a iconnect mio

    thanks much!

    Would Love to see a pic when you’ve got the time. ;)

  • @Kites
    i finished them up yesterday and took some pics (i made 2)
    but then i remembered that this forum doesn't let u upload pics anymore :(
    its pretty simple tho honestly.
    connect both power pads to a 5V source, grounds to ground, RX to TX, TX to RX

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