I know that in the RS games client on macos you can hit F2 and F3 to tweak the music volume and that usually works for me. You're also supposed to be able to adjust the volume of sounds with F5 and F6 but I can't get that to work. I can barely hear the game sounds. Anyone know if there's a way to reset them?
I wish they could figure out a way to have the client to use VoiceOver instead of the system speech. It gets rather annoying having to adjust speech settings every time you start.