Show Cue System

I have not been able to find anything within SCS regarding altering pitch/speed/tempo of an audio cue (if there is anything that is).
I was operating sound for a theatre performance last week and suddenly found part way through the performance on Saturday night that the sound of certain tracks (particularly effects with music/voice) sounded wrong and to the point that voices didn't sound like the people they were meant to be.
Can anyone help me with this and has anyone else experienced this issue whilst using SCS? Other members of cast and crew noticed the issue and asked me what was wrong, so it was not just me.

Could you email me a diagnostic file? You can create this file by selecting 'Create Diagnostic File' from the drop-down menu displayed when you click the Help button in the main window. The file will be saved in a folder named "SCS Diagnostics" under "Documents" or "My Documents". Let me know which cue(s) sounded wrong.