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Hello,

I am using my Presonus 24:4:2 digital mixing console as a soundcard with a macbook and OSX.

I have been trying to do a soundcard calibration in REW but I dont sem to be able to achieve loopback.

I can get the tone to playback via the firewire into the desk but when I patch the physical outputs to the channel inputs (1 and 2) REW does not detect any signal.

REW does not list Presonus Firestudio in the input devices so I have left it as default.

I would anticipate the response to be fairly flat anyway being a pro device but it would be reasuring to calibrate.

Any ideas appreciated. Cheers.
 

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Unfortunately Apple's Java runtime has a bug that prevents Java applications accessing the inputs of firewire-connected soundcards. It might be fixed in Oracle's Java runtime for OS X. If the macbook has a line input that would work for measurement.
 
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