Originally Posted by Cowbell_Guy
Any app to. Increase ringer volume? On an AOSP rom
Sent from my SCH-I545 using Tapatalk 2
You'll need to edit system files to increase the sound output of the external speaker (it would effect everything the speaker plays, from ringtones to music). It's pretty easy to do on Touchwiz 4.4.2, but I haven't messed around with AOSP.
You can check the instructions I posted here (for increasing sound output in Touchwiz) and see if the file/process would be the same for AOSP.
No guarantee it'll be the same, but might be worth checking out. Back everything up first of course!