Oh!, I think I also misunderstood you.
I see what you're saying now.
Using a CD, or whatever, that they play, set up a processing chain in my own equipment (software probably in my case) that mimics the end result of the station's broadcast of the CD. Run my own mixes through that chain of processing to mimic what it would sound like on air.
That's what I was going for, really. A way to check how my own mixes might come across on air, so that I can stop all this second-guessing routine.
That might just get me close enough.
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