pub trait GainControlProxyInterface: Send + Sync {
type SetGainResponseFut: Future<Output = Result<GainControlSetGainResult, Error>> + Send;
type SetMuteResponseFut: Future<Output = Result<GainControlSetMuteResult, Error>> + Send;
// Required methods
fn set_gain(
&self,
payload: &GainControlSetGainRequest,
) -> Self::SetGainResponseFut;
fn set_mute(
&self,
payload: &GainControlSetMuteRequest,
) -> Self::SetMuteResponseFut;
}