I don't think this issue has come up before. I can see the potential of conflict though in having multiple recorded .wav files within the same trial as DirectRT uses the trial ID to name the sound file. I don't think there is an easy way around this. I can imagine a couple workarounds but you would need a programmer and it sounds like you are in a hurry. I don't think there is an easy or quick solution unless you can manage to restructure the trials such that you are collecting only one .wav file per trial. I don't think that's going to help in your case though. If you are interested in what would be an at least moderately complicated solution let me know and I can elaborate. Gist would be to write a small application that continuously monitors the wav file folder and appends the current time to the file name whenever a new file appears within that folder.