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procedure MasterVolume(const lautstarrke : Word);
var
 W1 : hwaveout;
 W2 : twaveformatex;
begin
 FillChar(w2, SizeOf(w2), 0);
 WaveOutOpen(@W1, WAVE_MAPPER, @W2, 0, 0, 0);
 waveOutSetVolume(w1, lautstarrke);
 WaveOutClose(w1);
end;                    

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RE:TRichedit;

procedure tform1.UpdateList;
var
  c,i,iLine,iCtrl,iCon:integer;
  h:HMixer;
  caps:PMixerCaps;
  Line,Line2:PMixerLine;
  ctrls:PMixerLineControls;
  pctrl:PMixerControl;
begin
  c:=mixerGetNumDevs;
  re.lines.add('DeviceCount: '+inttostr(c));

  for i:=0 to c-1 do
    if mixerOpen(@h,i,0,HInstance,MIXER_OBJECTF_MIXER) = MMSYSERR_NOERROR then begin

      // Device Caps ( Infos zum Treiber )
      if mixerGetDevCaps(h,@caps,sizeof(caps)) = MMSYSERR_NOERROR then begin
        re.lines.add('');
        re.lines.add(inttostr(i)+': '+caps.szPname);
        re.lines.add('  - Driver-Version: '+ inttostr(caps.vDriverVersion) );
        re.lines.add('  - Destinations: '+ inttostr(caps.cDestinations) );

        // Line-Destinations ( Volume Control, Recording Control,... )
        for iLine:=0 to caps.cDestinations-1 do begin
          line.cbStruct:=sizeof(line);
          line.dwDestination:=iLine;
          if mixerGetLineInfo(h,@line,MIXER_GETLINEINFOF_DESTINATION) = MMSYSERR_NOERROR then begin

            re.lines.add('');
            re.lines.add('    - '+inttostr(iLine)+': '+line.szName+' ['+line.szShortName+']');
            case line.Target.dwType of
              mixerline_targettype_aux: re.lines.add('      - TargetType: aux');
              mixerline_targettype_midiin: re.lines.add('      - TargetType: midiin');
              mixerline_targettype_midiout: re.lines.add('      - TargetType: midiout');
              mixerline_targettype_undefined: re.lines.add('      - TargetType: undefined');
              mixerline_targettype_wavein: re.lines.add('      - TargetType: wavein');
              mixerline_targettype_waveout: re.lines.add('      - TargetType: waveout');
              end;
            re.lines.add('      - Channels: '+inttostr(line.cChannels));
            re.lines.add('      - Controls: '+inttostr(line.cControls));

            // Line-Controls ( Master Controls [Volume,Mute] )
            ctrls.cbStruct:=sizeof(ctrls);
            ctrls.cControls:=line.cControls;
            ctrls.cbmxctrl:=sizeof(TMixerControl);
            GetMem(pctrl,SizeOf(TMixerControl)*line.cControls);
            ctrls.pamxctrl:=pctrl;
            if mixerGetLineControls(h,@ctrls,MIXER_GETLINECONTROLSF_ALL) = mmsyserr_noerror then
              for iCtrl:=0 to line.cControls-1 do begin
                re.lines.add('        - '+inttostr(iCtrl)+': '+pctrl^.szName);
                inc(pctrl);
                end;
            FreeMem(pCtrl);

            // Line-Connections  ( WAVE, LineIn, Mic, CD, usw. )
            re.lines.add('      - Connections: '+inttostr(line.cConnections));
            line2.cbStruct:=sizeof(TMixerLine);
            line2.dwDestination:=line.dwDestination;
            for iCon:=0 to line.cConnections-1 do begin
              line2.dwSource:=iCon;

              if mixerGetLineInfo(h,@line2,MIXER_GETLINEINFOF_SOURCE) = mmsyserr_noerror then begin
                re.Lines.add('        - '+inttostr(iCon)+': '+line2.szName+'  |  Channels:'+inttostr(line2.cChannels)+'  |  Controls:'+inttostr(line2.cControls));

                // Connection-Controls ( Volume,Mute,usw. )
                ctrls.cbStruct:=sizeof(ctrls);
                ctrls.dwLineID:=line2.dwLineID;
                ctrls.cControls:=line2.cControls;
                ctrls.cbmxctrl:=sizeof(TMixerControl);
                GetMem(pctrl,sizeof(tmixercontrol)*line2.cControls);
                ctrls.pamxctrl:=pctrl;
                if mixerGetLineControls(h,@ctrls,MIXER_GETLINECONTROLSF_ALL) = mmsyserr_noerror then
                  for iCtrl:=0 to ctrls.cControls-1 do begin
                    re.lines.add('          - '+inttostr(iCtrl)+': '+pctrl^.szName);
                    inc(pctrl);
                    end;
                FreeMem(pctrl);

                end;
              end;
            end;
          end;
        end;

      mixerClose(h);
      end;
end;