WP8 speaker bug?

It has always been like that for Call Volume since WP7 days... 10 is the max.
For Other Volumes, such as notifications and Media, max is 30.
 
Sound is really low, only 10/10 when talking through speaker. It needs 30/30.
Mathematically speaking, 10/10 = 30/30 = 1,000,000/1,000,000 = 1 = 100%. Are you asking for finer-grained call volume control or a higher total volume? Maybe you really want 30/10? ;)