Yeah, the hijack volume offset feature was put in place a very long time ago. An example of the syntax is:

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

You didn't ask about the first one, but it's a useful one.

Note that the volume_boost numbers are either a normal number (positive DB) or a negative number (negative DB).
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Tony Fabris