Audio output via firewire

11-30  Source: Network gathering  Views:1 

I can not get audio working through firewire on my late 2013 MacBook Pro 13".
If I test channels in channel setup it gives me static, but if I play iTunes od Spybot nothing happens.
Internal speakers work fine.
Any ideas what to do?
I am connecting it through the firewire thunderbolt adapter. Then firewire 400/800 cable, because Presonus mixer has Firewire s400 port.
Funny is that iTunes worked fine in the morning. Then I started to check why I can not play Youtube through firewire. From Audio MIDI Setup - Presonus Firestudio - Output - Configure Speakers I changed Multichannel channels. That was all I changed.
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