To use this Roland Edirol UA - 25EX, first connect it to your computer via the USB port. You can then use it for audio and MIDI functions. Note that since it doesn't have a power supply, you need to make sure your computer can provide enough power. When you're done using it, just disconnect it from the computer. To keep it in good condition, keep it in a dry and clean place, and avoid dropping or hitting it.
