Awesome module. Works great on my XZ1C. I do not understand why they still have 7 or so volume steps in Android while millions of people listen to music or podcasts or whatever using bluetooth headphones. This module is a must have - unfortunately. Thanks for your efforts.
Just a reminder for those who encounter problems. ro.config.vc_call_vol_steps=14
ro.config.media_vol_steps=30 won't work for all devices, such as OnePlus 3, at least on its official OxygenOS.
Once you change your media volume steps from default 15 to the 30, using the script above which is included in the module, on your OnePlus 3. The steps are increased, while it's just a loop. The volume drop back to the lowest again at the 16th step and totally silent at some steps bigger than 20.
BTW, the xposed module VolumeSteps+ won't work on OnePlus 3 either.