It's easy to do this using simple audio recordings and a linear framed scenario.
Record yourself using windows recorder or any audio recording software. Save the files individually as .wav files in the 'Save As' menu. Welcome them to your sim lab, introduce the manikin, explain where the manikin has pulses, discuss the reactive pupils. ect... Think of this as the flight attendents sort of naration for what to do in event of a water landing! Discuss the policies of the lab, whether food/drink/pens are allowed, and any background information about your sim lab they should know. Be sure to record a seperate file asking the participants to "now touch the left radial pulse to continue."
Import these .wav media files to your simman software
Create a scenario in which you drop each .wav file into a seperate frame. You'll have a frame welcoming them, a frame introducing the different hear/lung sounds, a frame about the policies...so on. Link the frames using 'Radial Pulse Check' event. Be sure to add the "now touch the left radial pulse to continue" file after the naration file.
You know have a self guided orientation to your sim center/ manikin that allows the users to move through the orientation at their own pace.
Feel free to email me for any details or questions at firstname.lastname@example.org