How many audio systems can play 2 audio streams sources at the same time?
Get another computer or Ipod, Ipad....
You can't, really. The only way to adjust the volume for clips in the Source Monitor is with the speaker volume, which would also affect any other audio sources.
I also like to listen to music when I'm scrubbing through footage, looking for b-roll. The way I kill the sound in Premiere so I don't have to listen to the chipmunk version of my footage when scrubbing is to go to Edit>Preferences>Audio Hardware and select "ASIO Settings". This gives me a few different output options. At least one option is required, so I just check an output that I'm not using and leave my main output unchecked. This effectively mutes Premiere.
Not the most elegant solution, but it works.
Shooternz, OSX allows for multiple sources to share system audio resources. It's been that way for a while. Thank goodness.
I can't remember the name of the utility offhand... AudioHiJack or similar, that allows users to set audio levels separately for every application that is using OS audio.
I often set up my stock music libraries on a web browser to play a playlist of music choices while I'm cutting. I can set the volume in the browser. But, as has been pointed out, you can't set volume in the Source viewer as of CS6, so I just try to set the volume of the browser accordingly.
Another option is to use a separate interface for Pr (They're cheap now.), and route Pr alone to it, and set volume on the interface, or at the fader of a audio mixer.
I want to be able to preview my footage without audio while still being able to listen to i tunes.
IMHO, this is what a laptop or mp3 player are for...
not your editing system.
I don't understand? Do you want to sample your audio or just listen to tunes? Anyway: source monitor > audio mixer > Master volume > lower
Now listen to your itunes. You can also just mute the audio in the timeline.
The Mixer only affects clips in the sequence, not the Source monitor.