Wave Lautstärke in Prozent angeben

[Nils_13]

Ich habe ein Volume-Trackbar. Hiermit setze und lese ich die Lautstärke aus

Delphi-Quellcode:

function TForm1.GetWaveVolume(var LVol: DWORD; var RVol: DWORD): Boolean;
var
  WaveOutCaps: TWAVEOUTCAPS;
  Volume: DWORD;
begin
  Result := False;
  if WaveOutGetDevCaps(WAVE_MAPPER, @WaveOutCaps, SizeOf(WaveOutCaps)) = MMSYSERR_NOERROR then
    if WaveOutCaps.dwSupport and WAVECAPS_VOLUME = WAVECAPS_VOLUME then
    begin
      Result := WaveOutGetVolume(WAVE_MAPPER, @Volume) = MMSYSERR_NOERROR;
      LVol   := LoWord(Volume);
      RVol   := HiWord(Volume);
    end;
end;

function TForm1.SetWaveVolume(const AVolume: DWORD): Boolean;
var
  WaveOutCaps: TWAVEOUTCAPS;
begin
  Result := False;
  if WaveOutGetDevCaps(WAVE_MAPPER, @WaveOutCaps, SizeOf(WaveOutCaps)) = MMSYSERR_NOERROR then
    if WaveOutCaps.dwSupport and WAVECAPS_VOLUME = WAVECAPS_VOLUME then
      Result := WaveOutSetVolume(WAVE_MAPPER, AVolume) = MMSYSERR_NOERROR;
end;

weil so hab ich ja immer 50%. Es soll aber der aktuelle Wert in Prozent angegeben werden.