I don't notice lower ringtone or music. In fact I've lowered my ring volume. Anyway, if you download the sitar I posted on page 10 and compare it to the original that comes with the ROM you can Google & compare the 2 files online to see exactly which values I changed. Aside from that, open the sitar file in Notepad++ and the following lines should help you experiment:
System Speaker Volume - Line 3526 (Be careful as this will also increase phone touch tones...EVERYTHING WILL GET VERY LOUD!)
Earpiece - Line 3359
Voice Earpiece - Line 3388 (Volume for actual phone calls)
Headphones - Line 3560 & 3561
Voice Headphones - 3591 & 3592
Speaker Headset - Lines 3622, 3623 & 3624
It's been a while since I posted the sitar but I didn't have luck with the in call speaker volume. However, I don't think I did anything to lines 3622-3624. Will need to experiment with those myself.
Good luck.