For reference, the relevant sections of config.ini on my player look like this:

[hijack]
suppress_notify=1
voladjlow=0x1500,400,0x1000,200,1100
voladjmed=0x1700,600,0x1000,200,600
voladjhigh=0x2200,1000,0x1000,100,500
keypress_flash=100
disable_bassboost_FM=1
volume_boost_FM=-2
volume_boost_AM=-6
volume_boost_AUX=4
[output]
notify=1
[serial]
car_rate=115200