On the android app.
The lesson audio has 0.5, 1.0, 1.5, 2.0
However, the Line-by-Line audio section does not have one. Can you put one in?
On that selection of speeds, maybe a more useful selection would be: 0.5, 0.75, 1.0, 1.25, 1.5
I can't imagine anyone listening at 2x speed.
OR.... replace the whole thing with a slider bar!