I have been using Ireal pro for a few years on my iphone, Ipad and Macbook with no problem ....
I decided to install on my mac Pro with OS 10.9.5 installed ( This mac is my pro music app and I use a Digidesign 003 interface for audio output)
I installed Ireal pro 6.01 and when I press play, I see the count in spinning and then it just stops without any sound ... so I went inside my mac's system preference and selected built-in outputs, but same thing.
Finally I went into the Audio output on the left bottom corner of Ireal Pro but no output is available ....
every other program on my mac works fine ( Logic, Protools, Youtube from safari, System sounds etc... )
What am I doing wrong ? why can't I select a output ?

Thanks for your help