I just bought a MIDI to USB cable so I could connect my electronic piano/keyboard to my mac mini. I open GarageBand and the keyboard will play one note at a time just fine, but if I play two or more notes at once, then the sound will kind of spaz out, with the two or three notes just lasting forever and no sound from any new notes being played. The sound only stops if I hit the spacebar about two or three times (to press play and stop).

The keyboard and mac mini I'm using never did this with the last MIDI to USB cable I had been using previously, I only stopped using that one because it was borrowed and I had to return it. The new looks pretty much the same as the old one though, are MIDI to USB cables not all created equal or something? How can I get GarageBand to play/record what I play even when I press more than one note?

  • Try to use a different software. PreSonus works for me... and usually, MIDI devices work better when connected to an external device like a StudioOne. I don't know why you GarageBand isn't working, but I recommend re-starting both devices, and reconfiguring the MIDI setup.
    – ALX
    May 13, 2016 at 0:43
  • Maybe even a less-expensive MIDI Synth
    – ALX
    May 13, 2016 at 0:45
  • 1
    Oh... and It could be your cabe too.
    – ALX
    May 13, 2016 at 0:46
  • What did you buy? I have the same one as you and same problem.
    – nullface
    Aug 31, 2017 at 22:40
  • @MichelleBergin I got a Roland um-one midi chord
    – RedCaio
    Sep 16, 2017 at 20:24

1 Answer 1


Buy a new midi cord.

I'm not sure why the first one didn't work, but I eventually bought a new midi cord/cable(s) and now the above problem doesn't happen.

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