The play solo volume and the studio volume setting are connected.
Play solo: .3
Studio: .3
And changing one will also change the other, so if the studio setting is set to .5, the next play session will also have its volume set to .5.
However, even though both of these settings are linked as one, changing the volume in play solo adjusts the studio setting, but it does NOT take effect. This means if you set your volume to be 0 in play mode, you will still be able to hear it in edit mode, until you set the studio setting to 0 as well.
Expected behavior
I expect the play solo volume to change the studio volume, and also immediately take effect.