Add voice guide

docs/guides/samples/audio_create_ffmpeg.cs

@@ -0,0 +1,11 @@
+private Process CreateStream(string path)
+{
+    var ffmpeg = new ProcessStartInfo
+    {
+        FileName = "ffmpeg",
+        Arguments = $"-i {path} -ac 2 -f s16le -ar 48000 pipe:1",
+        UseShellExecute = false,
+        RedirectStandardOutput = true,
+    };
+    return Process.Start(ffmpeg);
+}

docs/guides/samples/audio_ffmpeg.cs

@@ -0,0 +1,9 @@
+private async Task SendAsync(IAudioClient client, string path)
+{
+    // Create FFmpeg using the previous example
+    var ffmpeg = CreateStream(path);
+    var output = ffmpeg.StandardOutput.BaseStream;
+    var discord = client.CreatePCMStream(1920);
+    await output.CopyToAsync(discord);
+    await discord.FlushAsync();
+}

docs/guides/samples/joining_audio.cs

@@ -1,15 +1,10 @@
-// Create an IAudioClient, and store it for later use
-private IAudioClient _audio;
-
-// Create a Join command, that will join the parameter or the user's current voice channel
 [Command("join")]
-public async Task JoinChannel(IUserMessage msg,
-    IVoiceChannel channel = null)
+public async Task JoinChannel(IVoiceChannel channel = null)
 {
     // Get the audio channel
     channel = channel ?? (msg.Author as IGuildUser)?.VoiceChannel;
     if (channel == null) { await msg.Channel.SendMessageAsync("User must be in a voice channel, or a voice channel must be passed as an argument."); return; }
 
-    // Get the IAudioClient by calling the JoinAsync method
-    _audio = await channel.JoinAsync();
+    // For the next step with transmitting audio, you would want to pass this Audio Client in to a service.
+    var audioClient = await channel.ConnectAsync();
 }