Quote:
I need to turn to volume much higher for the same sound level and thus I also increase the noise.

There is a feature in Hijack which allows you to add a config.ini entry to control the relative volume level of the tuner module and the AUX input.

[hijack]
disable_bassboost_FM=1
volume_boost_FM=-2
volume_boost_AM=-6
volume_boost_AUX=4

Those are from my config.ini. Note that on mine, I've actually had to TURN DOWN the tuner module in relation to the MP3 levels. So I suspect you might have some kind of a wiring problem that is causing your tuner module to put out unusually low volumes.
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Tony Fabris