Quote:
Originally Posted by Darryl Ramm
I am not sure if the latest drivers work on El Capitan. Apple unfortunately broke lots of USB audio interfaces from lots of vendors in the El Capitan release. A really poor mess from them
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As Darryl said. El Capitan is your issue. You can either wait for Avid to release updated drivers or roll back to Yosemite or earlier for Mbox compatibility