Audio volume adjustment in app

Hello,

# Problem
You can not adjust the volume of the podcast itself, only the volume of the phone.
This may be a problem while doing other stuff, like playing games, because then the podcast may be too loud or too quiet in comparison to the game.

# Solution idea
One solution that comes into my mind is adding a volume slider at the replay options (below the speed adjustment)

Thank you

Start by locating the replay options UI and the podcast audio playback entry point; no file or test is identified in the issue. The change is complete when a slider below the speed adjustment independently changes podcast volume while other phone audio, such as a game, remains separately adjustable.

Written by the indexing model from the issue text.