chore(apu): change access modifiers of some methods

src/main.rs

@@ -3,7 +3,7 @@ use clap::{crate_authors, crate_description, crate_name, crate_version, App, Arg
 use gb::{AudioMPSC, Cycle, Egui, GB_HEIGHT, GB_WIDTH};
 use gilrs::Gilrs;
 use pixels::{Pixels, SurfaceTexture};
-use rodio::{OutputStream, Sink};
+use rodio::OutputStream;
 use std::time::Instant;
 use winit::dpi::LogicalSize;
 use winit::event::{Event, VirtualKeyCode};
@@ -67,7 +67,7 @@ fn main() -> Result<()> {
     };
 
     let (send, recv) = AudioMPSC::init();
-    game_boy.set_audio_src(send);
+    game_boy.apu_mut().set_audio_sender(send);
 
     // Initialize Audio
     let (_stream, stream_handle) = OutputStream::try_default().expect("Initialized Audio");