I too am having a problem with the initial setup of my UX-1.
After installing all software as instructed the sounds emitted from my speakers is very slow and garbled. There are no popping sounds. I have tried uninstalling and reinstalling drivers. Different versions of the Monkey have met with the same results. I have disable any and all evidence of onboard sound recording and playback devices.
If I plug a guitar into the UX-1 and strum everything is garbled then as well but there IS sound emitting from speakers just not the correct sound.