Add dei ports 0x2 and 0x4 to audio devices

src/devices/audio.c

@@ -303,3 +303,13 @@ audio_start(int idx, Uint8 *d, Uxn *u)
         note_off(&channel[idx], duration);
     }
 }
+
+Uint8
+audio_get_vu(int instance) {
+    return channel[instance].sample.env.vol * 255.0f;
+}
+
+Uint16
+audio_get_position(int instance) {
+    return channel[instance].sample.pos;
+}

src/uxnemu.c

@@ -70,10 +70,14 @@ clamp(int v, int min, int max)
 static Uint8
 audio_dei(int instance, Uint8 *d, Uint8 port)
 {
-    /* TODO: get envelope */
     switch(port) {
-        case 0x0:
         case 0x2:
+            return audio_get_position(instance) >> 8;
+        case 0x3:
+            return audio_get_position(instance);
+        case 0x4:
+            return audio_get_vu(instance);
+        case 0x0:
         case 0x8:
         case 0xa:
         case 0xc: return PEEK2(d + port);