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diff --git a/src/media/UAudioPlaybackBase.pas b/src/media/UAudioPlaybackBase.pas
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+{* UltraStar Deluxe - Karaoke Game
+ *
+ * UltraStar Deluxe is the legal property of its developers, whose names
+ * are too numerous to list here. Please refer to the COPYRIGHT
+ * file distributed with this source distribution.
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License
+ * as published by the Free Software Foundation; either version 2
+ * of the License, or (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; see the file COPYING. If not, write to
+ * the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
+ * Boston, MA 02110-1301, USA.
+ *
+ * $URL$
+ * $Id$
+ *}
+
+unit UAudioPlaybackBase;
+
+interface
+
+{$IFDEF FPC}
+  {$MODE Delphi}
+{$ENDIF}
+
+{$I switches.inc}
+
+uses
+  UMusic,
+  UTime,
+  UPath;
+
+type
+  TAudioPlaybackBase = class(TInterfacedObject, IAudioPlayback)
+    protected
+      OutputDeviceList: TAudioOutputDeviceList;
+      MusicStream: TAudioPlaybackStream;
+      function CreatePlaybackStream(): TAudioPlaybackStream; virtual; abstract;
+      procedure ClearOutputDeviceList();
+      function GetLatency(): double; virtual; abstract;
+
+      // open sound or music stream (used by Open() and OpenSound())
+      function OpenStream(const Filename: IPath): TAudioPlaybackStream;
+      function OpenDecodeStream(const Filename: IPath): TAudioDecodeStream;
+    public
+      function GetName: string; virtual; abstract;
+
+      function Open(const Filename: IPath): boolean; // true if succeed
+      procedure Close;
+
+      procedure Play;
+      procedure Pause;
+      procedure Stop;
+      procedure FadeIn(Time: real; TargetVolume: single);
+
+      procedure SetSyncSource(SyncSource: TSyncSource);
+
+      procedure SetPosition(Time: real);
+      function  GetPosition: real;
+
+      function InitializePlayback: boolean; virtual; abstract;
+      function FinalizePlayback: boolean; virtual;
+
+      //function SetOutputDevice(Device: TAudioOutputDevice): boolean;
+      function GetOutputDeviceList(): TAudioOutputDeviceList;
+
+      procedure SetAppVolume(Volume: single); virtual; abstract;
+      procedure SetVolume(Volume: single);
+      procedure SetLoop(Enabled: boolean);
+
+      procedure Rewind;
+      function  Finished: boolean;
+      function  Length: real;
+
+      // Sounds
+      function OpenSound(const Filename: IPath): TAudioPlaybackStream;
+      procedure PlaySound(Stream: TAudioPlaybackStream);
+      procedure StopSound(Stream: TAudioPlaybackStream);
+
+      // Equalizer
+      procedure GetFFTData(var Data: TFFTData);
+
+      // Interface for Visualizer
+      function GetPCMData(var Data: TPCMData): Cardinal;
+
+      function CreateVoiceStream(Channel: integer; FormatInfo: TAudioFormatInfo): TAudioVoiceStream; virtual; abstract;
+  end;
+
+
+implementation
+
+uses
+  ULog,
+  SysUtils;
+
+{ TAudioPlaybackBase }
+
+function TAudioPlaybackBase.FinalizePlayback: boolean;
+begin
+  FreeAndNil(MusicStream);
+  ClearOutputDeviceList();
+  Result := true;
+end;
+
+function TAudioPlaybackBase.Open(const Filename: IPath): boolean;
+begin
+  // free old MusicStream
+  MusicStream.Free;
+
+  MusicStream := OpenStream(Filename);
+  if not assigned(MusicStream) then
+  begin
+    Result := false;
+    Exit;
+  end;
+
+  //MusicStream.AddSoundEffect(TVoiceRemoval.Create());
+
+  Result := true;
+end;
+
+procedure TAudioPlaybackBase.Close;
+begin
+  FreeAndNil(MusicStream);
+end;
+
+function TAudioPlaybackBase.OpenDecodeStream(const Filename: IPath): TAudioDecodeStream;
+var
+  i: integer;
+begin
+  for i := 0 to AudioDecoders.Count-1 do
+  begin
+    Result := IAudioDecoder(AudioDecoders[i]).Open(Filename);
+    if (assigned(Result)) then
+    begin
+      Log.LogInfo('Using decoder ' + IAudioDecoder(AudioDecoders[i]).GetName() +
+        ' for "' + Filename.ToNative + '"', 'TAudioPlaybackBase.OpenDecodeStream');
+      Exit;
+    end;
+  end;
+  Result := nil;
+end;
+
+procedure OnClosePlaybackStream(Stream: TAudioProcessingStream);
+var
+  PlaybackStream: TAudioPlaybackStream;
+  SourceStream: TAudioSourceStream;
+begin
+  PlaybackStream := TAudioPlaybackStream(Stream);
+  SourceStream := PlaybackStream.GetSourceStream();
+  SourceStream.Free;
+end;
+
+function TAudioPlaybackBase.OpenStream(const Filename: IPath): TAudioPlaybackStream;
+var
+  PlaybackStream: TAudioPlaybackStream;
+  DecodeStream: TAudioDecodeStream;
+begin
+  Result := nil;
+
+  //Log.LogStatus('Loading Sound: "' + Filename + '"', 'TAudioPlayback_Bass.OpenStream');
+
+  DecodeStream := OpenDecodeStream(Filename);
+  if (not assigned(DecodeStream)) then
+  begin
+    Log.LogStatus('Could not open "' + Filename.ToNative + '"', 'TAudioPlayback_Bass.OpenStream');
+    Exit;
+  end;
+
+  // create a matching playback-stream for the decoder
+  PlaybackStream := CreatePlaybackStream();
+  if (not PlaybackStream.Open(DecodeStream)) then
+  begin
+    FreeAndNil(PlaybackStream);
+    FreeAndNil(DecodeStream);
+    Exit;
+  end;
+
+  PlaybackStream.AddOnCloseHandler(OnClosePlaybackStream);
+
+  Result := PlaybackStream;
+end;
+
+procedure TAudioPlaybackBase.Play;
+begin
+  if assigned(MusicStream) then
+    MusicStream.Play();
+end;
+
+procedure TAudioPlaybackBase.Pause;
+begin
+  if assigned(MusicStream) then
+    MusicStream.Pause();
+end;
+
+procedure TAudioPlaybackBase.Stop;
+begin
+  if assigned(MusicStream) then
+    MusicStream.Stop();
+end;
+
+function TAudioPlaybackBase.Length: real;
+begin
+  if assigned(MusicStream) then
+    Result := MusicStream.Length
+  else
+    Result := 0;
+end;
+
+function TAudioPlaybackBase.GetPosition: real;
+begin
+  if assigned(MusicStream) then
+    Result := MusicStream.Position
+  else
+    Result := 0;
+end;
+
+procedure TAudioPlaybackBase.SetPosition(Time: real);
+begin
+  if assigned(MusicStream) then
+    MusicStream.Position := Time;
+end;
+
+procedure TAudioPlaybackBase.SetSyncSource(SyncSource: TSyncSource);
+begin
+  if assigned(MusicStream) then
+    MusicStream.SetSyncSource(SyncSource);
+end;
+
+procedure TAudioPlaybackBase.Rewind;
+begin
+  SetPosition(0);
+end;
+
+function TAudioPlaybackBase.Finished: boolean;
+begin
+  if assigned(MusicStream) then
+    Result := (MusicStream.Status = ssStopped)
+  else
+    Result := true;
+end;
+
+procedure TAudioPlaybackBase.SetVolume(Volume: single);
+begin
+  if assigned(MusicStream) then
+    MusicStream.Volume := Volume;
+end;
+
+procedure TAudioPlaybackBase.FadeIn(Time: real; TargetVolume: single);
+begin
+  if assigned(MusicStream) then
+    MusicStream.FadeIn(Time, TargetVolume);
+end;
+
+procedure TAudioPlaybackBase.SetLoop(Enabled: boolean);
+begin
+  if assigned(MusicStream) then
+    MusicStream.Loop := Enabled;
+end;
+
+// Equalizer
+procedure TAudioPlaybackBase.GetFFTData(var data: TFFTData);
+begin
+  if assigned(MusicStream) then
+    MusicStream.GetFFTData(data);
+end;
+
+{*
+ * Copies interleaved PCM SInt16 stereo samples into data.
+ * Returns the number of frames
+ *}
+function TAudioPlaybackBase.GetPCMData(var data: TPCMData): Cardinal;
+begin
+  if assigned(MusicStream) then
+    Result := MusicStream.GetPCMData(data)
+  else
+    Result := 0;
+end;
+
+function TAudioPlaybackBase.OpenSound(const Filename: IPath): TAudioPlaybackStream;
+begin
+  Result := OpenStream(Filename);
+end;
+
+procedure TAudioPlaybackBase.PlaySound(stream: TAudioPlaybackStream);
+begin
+  if assigned(stream) then
+    stream.Play();
+end;
+
+procedure TAudioPlaybackBase.StopSound(stream: TAudioPlaybackStream);
+begin
+  if assigned(stream) then
+    stream.Stop();
+end;
+
+procedure TAudioPlaybackBase.ClearOutputDeviceList();
+var
+  DeviceIndex: integer;
+begin
+  for DeviceIndex := 0 to High(OutputDeviceList) do
+    OutputDeviceList[DeviceIndex].Free();
+  SetLength(OutputDeviceList, 0);
+end;
+
+function TAudioPlaybackBase.GetOutputDeviceList(): TAudioOutputDeviceList;
+begin
+  Result := OutputDeviceList;
+end;
+
+end.