Please tell me little bit more details about your setup.
Is the AudioLan card sends or receives streams?
If you have distorted audio on the receiver side you should see error message which can tell you more details about the cause of the distortion.
You said “The audiolan card is connected direct to a apple imac computer” so there’s no switch between?
But if there’s no switch how do you able to connect uTrack24 (uRemote) and the AudioLan card to the same network?
Please tell me what networking gear are you using and how the whole system looks like?
Please also tell me the firmware version on the uTrack24 as well the AudioLan card