For Example: SOUNDS=NNNNNYNNNNNNNN would only play Sound #6 (Keyb-OOS.wav)
which is associated with a keyboard sample being entered that is Out-Of-Spec.
You may also RECORD your own WAV files if you want (using recording software).
Each can be a sound effect or a spoken voice message.
Just be sure to name them the same as the WAV filenames already being used in SPC Express.