Dave Smith Instruments MOPHO X4 - Manual (Page 42)

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Windows Vista and Windows 7 behave the same as XP, but the device name is
DSI Mopho x4 rather than USB Audio Device.
In Windows, if you unplug the USB cable and plug it back in while a program
has the Mopho x4 port open, you may have to resync. That usually means going
to the USB Audio Device (or DSI Mopho x4) Properties, as in the procedure
above, and clicking OK. If Mopho x4 is no longer listed in the Device Manager
under “Sound, video, and game controllers,” power Mopho x4 down and back
up again while it is connected via USB. It should be detected on power up.