feat: improve RenPy conversion and support MIST runtime

frontend/tests/audio.test.mjs

@@ -33,6 +33,18 @@ function tick(ms) {
 const volumes = () => ({ music: 0.7, sound: 0.8, voice: 1 });
 const system = (registered = {}) => new AudioSystem(volumes(), (file) => file, registered);
 
+test("custom mixers control only their channels and survive changes to shared volumes", () => {
+  const audio = system({ ambient: { mixer: "ambiant", loop: true }, ambient2: { mixer: "ambiant", loop: true } });
+  audio.play("ambient", ["one"], {});
+  audio.play("sound", ["effect"], {});
+  audio.setMixer("ambiant", 0.3);
+  assert.deepEqual(elements.map((el) => el.volume), [0.3, 0.8]);
+  audio.setVolumes({ music: 0, sound: 0.2, voice: 1 });
+  audio.play("ambient2", ["two"], {});
+  assert.deepEqual(elements.map((el) => el.volume), [0.3, 0.2, 0.3]);
+  assert.equal(audio.mixerVolume("ambiant"), 0.3);
+});
+
 test("volume changes apply immediately to each mixer and future tracks", () => {
   const audio = system({ ambience: { mixer: "sfx", loop: true }, score: { mixer: "music", loop: true } });
   for (const ch of ["music", "sound", "voice", "ambience", "score"]) audio.play(ch, [ch], {});