Unfortunately not. The program can only manipulate sound files for PS2 and PS3 engines. There is no way to download the sound files from a PS1 engine.
You could manually record the PS1 whistle and import it into the PS2 or PS3 sound file but you would lose some sound quality as you would be playing back a copy of a copy. The key would be to make sure that you are making the best possible audio recording of the PS1 whistle when recording the file from the original engine.
