pub fn nr42(&self) -> u8 {
        let envelope = self.sound4.envelope();

        envelope.into_reg()
    }
/// Retreive envelope config for sound 1
Retreive envelope config for sound 1
Retreive envelope config for sound 1
pub fn nr42(&self) -> u8 {
        let envelope = self.sound4.envelope();
        envelope.into_reg()
    }
pub fn nr42 ( & self ) -> u8 { let envelope = self . sound4 . envelope ( ) ; envelope . into_reg ( ) }
Retreive envelope config for sound 1
Retreive envelope config for sound 1
&self
&self