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.