Exclamation [Q] Sound level of ringtone

Hi!
Is there any chance to setup ringtone level for incoming call on JB 4.1.2 (root and unlock) from beginning to 100% loud. As everybody know in JB there in no option like "increasing volume for incoming call" but it's works like that. I get many times missed call by this and it's really annoying!
Thx for help!
Use to have LG P920, but tired of waiting for fully working ICS I sold it, and now I'm looking for something new...And I found another LG phone call LG Swift X4 HD