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The MIDI implementation is a bit weird, in that it uses a different channel per sample and various CCs to play them in different ways. But you can control it from a computer using a USB adapter. I haven't used the particular adapter you're referencing; I use a Roland UM-ONE MK2. There are tutorials out there about how to use something like Pure Data or an Android app to play the samples via a PC or Android device, e.g. http://filipe-teixeira.com/electronic-music/volca-resources/volca-sample-tutorial-5-midi-and-external-automation/ which references https://play.google.com/store/apps/details?id=com.appspot.microvolcasample&hl=en