Second pass audio transition changes

Let's try and find a sweet spot somewhere between lazer and stable that
we can all be happy with 🙃.

Author: peppy

osu.Game/Beatmaps/WorkingBeatmap.cs

@@ -134,7 +134,7 @@ public void PrepareTrackForPreview(bool looping, double? offsetFromPreviewPoint
             if (Track.RestartPoint < 0 || Track.RestartPoint > Track.Length)
                 Track.RestartPoint = 0.4f * Track.Length;
 
-            offsetFromPreviewPoint ??= -MusicController.TRACK_FADE_IN_TIME;
+            offsetFromPreviewPoint ??= -MusicController.DELAY_BEFORE_FADE;
 
             Track.RestartPoint = Math.Clamp(Track.RestartPoint + offsetFromPreviewPoint.Value, 0, Track.Length);
         }

osu.Game/Overlays/MusicController.cs

@@ -37,8 +37,7 @@ public partial class MusicController : CompositeDrawable
         /// </summary>
         private const double restart_cutoff_point = 5000;
 
-        public const double TRACK_FADE_IN_TIME = 250;
-        public const double TRACK_FADE_OUT_TIME = 100;
+        public const double DELAY_BEFORE_FADE = 30;
 
         /// <summary>
         /// Whether the user has requested the track to be paused. Use <see cref="IsPlaying"/> to determine whether the track is still playing.
@@ -514,20 +513,23 @@ private void changeBeatmap(WorkingBeatmap newWorking)
 
         private void changeTrack()
         {
+            const double track_fade_in_time = 220;
+            const double track_fade_out_time = 150;
+
             var queuedTrack = getQueuedTrack();
 
             var lastTrack = CurrentTrack;
             lastTrack.Completed -= onTrackCompleted;
 
             CurrentTrack = queuedTrack;
 
-            lastTrack.VolumeTo(0, TRACK_FADE_OUT_TIME, Easing.Out).Expire();
+            lastTrack.VolumeTo(0, track_fade_out_time, Easing.Out).Expire();
 
             if (queuedTrack == CurrentTrack)
             {
                 queuedTrack.Volume.Value = 0;
                 AddInternal(queuedTrack);
-                queuedTrack.Delay(50).VolumeTo(1, TRACK_FADE_IN_TIME, Easing.Out);
+                queuedTrack.Delay(DELAY_BEFORE_FADE).VolumeTo(1, track_fade_in_time);
             }
             else
             {

osu.Game/Screens/Play/BeatmapMetadataDisplay.cs

@@ -136,7 +136,7 @@ private void load(BeatmapDifficultyCache difficultyCache, OsuColour colours)
                             Anchor = Anchor.TopCentre,
                             CornerRadius = 10,
                             Masking = true,
-                            Children = new Drawable[]
+                            Children = new[]
                             {
                                 new Sprite
                                 {