Rosendahl mif 4 - Manual (Page 12)

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8. USB drivers
mif4 is a so called "device class compliant USB Audio Device" and
does not need a driver installation. Windows XP or later as well as
Mac OS X provide generic USB audio drivers.
If you plug in the unit for the first time Windows will find the new
hardware and install its generic drivers automatically.
If mif4 isn't detected by Windows you may need to configure the
Windows Device Manager to show all hidden and ghosted devices to
evaluate the problem and possibly remove/delete obsolete devices.
Find help at Microsoft support how to display ghosted devices in
Device Manager….
Unfortunately Windows generic USB Audio Device drivers do not
provide multi-client capability, which means you can only use one
application with the USB MIDI I/O ports at once.
So you can not receive the mif4 MTC MIDI time code with two
different programs simultaneously.
Specific mif4 multi-client capable, low latency drivers for 32- and 64-
bit Microsoft Windows systems can be downloaded at
www.rosendahl-studiotechnik.com .
Thanks to Ploytec GmbH for their excellent work!
Mac OS X USB drivers support multiple clients and thus, there is no
need to install extra mif4 device drivers.
To verify the generic OS X driver installation please run
Applications/Utilities/Audio MIDI Setup and open the Window "MIDI
Studio".