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procedure TForm2.FormCreate(Sender: TObject);
var
  Format: tWAVEFORMATEX;
begin
  with Format do
  begin
    wFormatTag := WAVE_FORMAT_PCM;
    nChannels := 1;
    wBitsPerSample := 8;
    nSamplesPerSec := 44100;
     nBlockAlign := nChannels * (wBitsPerSample div 8);
    nAvgBytesPerSec := nSamplesPerSec * nBlockAlign;
    cbSize := 0;
  end;
 wave := TWaveIn.Create;
 wave.OnData := OnData;
 wave.open(0);
 waveOutOpen(@fHandle, 0, @format, 0, 0, CALLBACK_NULL);
 fStream:=TMemoryStream.Create;
end;

procedure TForm2.OnData(const aStream: TMemoryStream);
begin
  fStream.CopyFrom(aStream,aStream.Size);
end;

//...
procedure waveInProc(hwi: HWAVEIN; uMsg: UINT; dwInstance, dwParam1, dwParam2 : DWord); stdcall;
var
  classinstance: TWaveIn absolute dwInstance;
  tmpBuff:PWaveHdr;
begin
 if umsg = WIM_DATA then
 begin
   with classinstance do
   begin
     tmpBuff:=PWaveHdr(dwParam1);
     //if(fCurBuff=fBuff1) then fCurBuff:=fBuff2
     //else fCurBuff:=fBuff1;
     if (tmpBuff.dwBytesRecorded = 0) or (tmpBuff.dwFlags and MHDR_DONE<>MHDR_DONE) then exit;
     fSyncStream.Clear;
     fSyncStream.Write(tmpBuff.lpData^, tmpBuff.dwBytesRecorded);
     fSyncStream.Position := 0;
     if Assigned(fOnData) then
      fOnData(fSyncStream);
     WaveInAddBuffer(fHandle, tmpBuff, SizeOf(TWaveHdr));
   end;
 end;
end;					

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procedure TForm2.Button1Click(Sender: TObject);
var header: TWaveHdr;
begin
  wave.close;
  fStream.Position:=0;
  header.lpData := fStream.Memory;
  header.dwBufferLength := fStream.Size;
  header.dwFlags := 0;
  waveOutPrepareHeader(fhandle, @header, sizeof(TWaveHdr));
  waveOutWrite(fhandle, @header, sizeof(TWaveHdr));
end;