asterisk users - Jul 2005 - Polycom gain settings

Hi All,

I have some Polycom IP300's and I'm interested in increasing the max
volume
for the headset (not handset), I'm wondering if anyone has experience 
adjusting these values:

<gains 
voice.gain.rx.analog.handset="0"
voice.gain.rx.analog.headset="0"
voice.gain.rx.analog.chassis="3"
voice.gain.rx.analog.chassis.obs="-12"
voice.gain.rx.analog.chassis.IP300="-6"
voice.gain.rx.analog.ringer="3"
voice.gain.rx.analog.ringer.IP300="-6"
voice.gain.rx.digital.handset="0"
voice.gain.rx.digital.headset="-21"
voice.gain.rx.digital.chassis="0"
voice.gain.rx.digital.chassis.obs="0"
voice.gain.rx.digital.ringer="-21"
voice.gain.rx.analog.handset.sidetone="-24"
voice.gain.rx.analog.headset.sidetone="-24"
voice.gain.tx.analog.handset="3"
voice.gain.tx.analog.headset="3"
voice.gain.tx.analog.chassis="3"
voice.gain.tx.analog.chassis.obs="6"
voice.gain.tx.digital.handset="0"
voice.gain.tx.digital.headset="0"
voice.gain.tx.digital.chassis="6"
voice.gain.tx.digital.chassis.obs="4"
voice.gain.tx.analog.preamp.handset="23"
voice.gain.tx.analog.preamp.headset="23"
voice.gain.tx.analog.preamp.chassis="42"
voice.gain.tx.analog.preamp.chassis.obs="20"
/>

Thanks,
Pete