Musicians & Producers: Do NOT Upgrade to Mac OS Sierra 10.12 Yet

If you're awaiting the launch of the new macOS Sierra from Apple and want to upgrade your music studio machine immediately.... don't. There's reports of issues with audio unit plug-ins flying in. ...

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Auch im Steinberg Forum wird geraten erst ein mal abzuwarten:
https://www.steinberg.net/forums/viewtopic.php?f=34&t=102068