Hello noeparenteauTo change the volume on MP you would need to do this system wide, which I would not recommend. I think you do have a good idea by using custom prompts. What you could do is record an alternative prompt at a lower volume and see if...
MeetingPlace 5.4 is for the enterprise customer that has an 81xx voice chassis. MPE (MeetingPlace Express) is a different product. Which is currently running the 2.x version.