16 bit stereo

Question

Hi, I'm converting mp3 to wav then modifying the wav and saving it to a new wav file. The saved wav files comes out as 16 bit mono. I need it to be 16 bit stereo like the original. I realize the following code does not account for the stereo (only 4 channels), but if someone could point out how I can correct it so the saved wav is stereo I would appreciate it. Thanks.
...snip     
if(numChan==4) {
   try {                          
      for (int r=0; r < audioByteData.length-4; r+=4) {
         loByte = audioByteData[r+0];                
         hiByte = audioByteData[r+1];
         //convert bytes to int
         sample = (hiByte << 8) | (loByte & 0x00FF);
         //raw audio sample array                
         audioInData[r/4] = (short)sample;  
   } catch (Exception ex){ex.printStackTrace();}                 
}

Answer 1

I have a similar problem with Audigy 2 using Soundforge. I found that if I set the recording device to Microsoft Sound Mapper instead of the asio driver it will work. Not sure of the implications of this. It seems to imply that the card is only ever receiving 48K and so the mapper needs to resample on the fly. Anyone know if this is the case? If so would I be better to record at 48K and then resample in Soundforge? (I am guessing that sf may do a better job). Thanks