How can I send audio from an application to the HDMI port on my Mac Mini while also sending the audio to another application?

I am trying to use VLC (or any streaming audio player) and listen to a web radio station while at the same time using Audacity to monitor the CODEC's digital level. I want to make a digital measurement of the level that the streaming radio station is using on the air. I can calibrate the levels for maxbit by overdriving my web stations encoder and watching for clipping distortion on the decode on Audacity (waveform view). I then calibrate the clipped value to the 0dB peak on Audacity's meters or waveform view. I also am trying to calibrate and use the free Orban Loudness meter. I require something like Soundflower (as others have indicated) but I find that sound flower is very unstable (or maybe mis-configured on my machine with Lion). I think there is a clock drift issue since Soundflower works well for some number of minutes and then distortion appears in one of the outputs (either the HDMI or the feed to Audacity/Orban Loudness Meter). I would have thought this was easy on a Mac, but as it turns out it is not. Am I missing something here and there is a way to send audio from one application to my HDMI output and another application?

Thanks Rudegar for the response. I was already afraid that Apple TV won't be of any help.
Is there no solution for getting an audio-stream into the "airplay-system", e.g. by using another apple device?

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