You could use a small mixer/splitter circuit or as mentioned just turn up the 'mic' fader and monitor the line in that you are capturing and processing for the feed.
The annoying part with the feed if you just do a basic audio feed is that you don't see the display of the scanner at the same time as the audio. Depending on your codec you use, there is latency of a few seconds after the audio hits the feed and by the time you decode it if you are listening to the feed.
Monitoring your own feed is useful anyway as you need to get a nice loud drive level from the scanner and adjust the capture level so there is no distortion. You need the right balance otherwise you can get distortion or excessive hiss. If you do it all right, it's totally clean with plenty of level.
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http://www.kc2rgw.com/
Various info on SDR, ham radio, monitoring, and rantings of a lunatic.
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