Add audio queue

index.js

@@ -21,6 +21,7 @@ async function initDB() {
 
 const api = {
     db: undefined,
+    queue: undefined,
     ttsEngines: (() => {
         let engines = {};
         console.log(`Registering TTS engines...`);
@@ -77,9 +78,8 @@ const api = {
     },
 
     speak: async (channel, message, engine = api.announcementEngine, voice = api.announcementVoice, params = {}) => {
-        const conn = api.getConnectionForVoiceChannel(channel);
         const filepath = await api.generateVoice(message, engine, voice, params);
-        if (conn) conn.play(filepath);
+        api.queue.add(filepath);
     },
 
     registerCommand: async (commandString, commandFunc) => {