Most likely you just need to change your output device; the output device can be set via the output plug-in (Options > Output plugins > configure). there's a drop-down menu where you select the output device.

I purchased a Musiland Monitor 01 US online & am having a terible time getting this to work with MM4. All the packaged materials as well as the maunal on the included CD are in Chinese. I have searched in vain but have not been able to locate an English manual online. I was not able to install the drivers from the CD(got an error message) but was able to download the driver online. I can get test tones (control panel: sound) to play via the RCA outputs on the unit but not music thru MM4. I'm guessing there is software I need yet from the errant CD & also wondering about needing a specific output plug in for MM. Any help would be appreciated. Especially with an English manual.