There doesn't seem to be any setting for volume and I can't figure out how to select a different character... whether they unlock through the story or when I get to a certain level. >_
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Ok, so it looks like you unlock characters as you go which is pretty meh.
You can turn off the music and I think voices by pushing your phone's back button and a little window should pop up. Or at least that's how I did it the first time... Read Note
Arknights
4.6https://www.gamasutra.com/view/pressreleases/343651/Yostar_Games_Announces_Publishing_Of_Its_New_Game_Arknights.php