Thanks for your help. Are you sure? Because my patch only gives my OS the command to open the BTS file. That is the only command going out of the Max patch. Also, it doesn't even know the file path to the mp3 file, it just checks the folder for new files and, if they have .mp3 or .wav extensions, it loads them into the internal audiobuffer. So it seems to me that Sync actually is giving the command to open it. Correct me if I'm wrong, and any help on solving this issue much appreciated