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[smithdale87]

This should get you on the right track. Mix and match pseudo code

-(void) concatFiles( NSString* path1, NSString* path2, NSString* combinedPath )
{
 NSFileHandle * f1Handle = [NSFileHandle fileHandleForReadingAtPath: path1];
 NSFileHandle *f2Handle = [NSFileHandle fielHandleForReadingAtPath: path2];

//might need to check if file exists first, if not create it using NSFileManager's createFileAtPath

 NSFileHandle * combinedHandle = [NSFileHandle fileHandleForWritingAtPath: combinedPath];



   // read data in small chunks to avoid hogging memory. 
   NSData* read  = [f1Handle readDataOfLength: CHUNK_SIZE] ;
      
    while( length of read != 0 )   

   {
       [combineHandle writeData: read];
       read = [f1Handle readDataOfLength: CHUNK_SIZE] ;
   }


   [f1Handle close];
   

    //now do the same for f2Handle

    //might need to ignore a few bytes in the front of file2 that isnt audio
    [f2Handle readDataOfLength: HEADER_LENGTH];


     NSData* read  = [f2Handle readDataOfLength: CHUNK_SIZE] ;
     while (... )
    {
    }
     [f2Handle close];
     [combineHandle close];
  
}