Unfortunately the UMC204 is one of those class compliant/driverless audio/midi interfaces that has never worked properly with the majority of USB3 ports found on modern Macs and PCs.. In the Mac's case the issues are even worse when running under Mavericks or now Yosemite..
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However, there is one possible fix you can try..
Connect the UMC204 to a powered USB2 hub and then connect the hub to your Mac's USB3 port.. In some cases this resolves some of the issues reported.
The UMC204 was also reported as one of the cheap audio/midi devices that has issues when connected to a Mac which uses a Fusion Drive under mavericks. However that issue should be fixed when using Yosemite for many people
Failing that, I would recommend trying to return the UMC204 if you can.. and buying an audio/midi interface that is known to work with modern OS's / Hardware such as one by Motu...
Bear in mind buying a cheap audio/midi interface to use with a Mac.. is akin to putting $50 tires on a $150,000 Ferrari.. It might work, sort of. Patch for corel draw 12. but the Ferrari will then drive like a Kia 🙂
May 17, 2015 6:50 AM