OK, let’s face it. Finding that exact right volume with which to listen to your tunes isn’t always as simple as one would initially believe. With songs having varying average sound levels and dynamic ranges, it’s hard to get it just right every time. Making matters worse, most devices have very coarse software volume adjustment, making it impossible to get it just right on any given song. Thankfully, XDA Senior Member Matt has taken care of the latter issue with his volume step modification for the HTC One.
The volume step modification is compatible with various popular Android 4.1- and 4.2-based ROMs including (but not limited to) CyanogenMod 10.1, AOKP, the Google Edition ROM, Sense-Based builds, as well as several others. He even offers both 30- and 45-step mods for certain ROMs. For most ROMs, Matt has given the option to apply the modification, as well as to uninstall it. However, if there’s no uninstall option for your own particular ROM, you can simply reflash the original ROM zip and reapply any /system partition changes you made after the ROM flash.
To get started, simply head over to the modification thread. Getting started is as simple as flashing the appropriate update.zip through your custom recovery of choice._________