In-call, not in-call, speakerphone, headset all have independent settings. Each profile has sub-settings such as ring volume, alarm volume, notification volume, system sound volume. These all have an "off" setting as well. Profiles do change on the fly affecting overall settings. Media player has it's own volume independent of the speaker volume.

I'm not sure buggy would be correct. Maybe flexible.

This has been a volume of information.