Function ev3dev_lang_rust::sound::set_volume

pub fn set_volume(volume: i32) -> Ev3Result<()>

Sets the sound volume to the given percentage [0-100] by calling amixer -q set <channel> <pct>%. It tries to determine the default channel by running amixer scontrols. If that fails as well, it uses the Playback channel, as that is the only channel on the EV3.