Is it a demonstrator or a demonstrator? Is it about a product or a process that you need to demonstrate to somebody, or are you protesting? Could be confusing, but if the formr is the thing you need, you should probably opt for demonstrator voices.
Presenting something to an audience or a general public can fall on deaf ears unless you use voices that are perfectly suited for such a purpose. The number of products, processess, how something works or how to get best results from any of those is practically limitless. But, througout any demonstration you need to keep the attention of your audience throughout. It can involve technical explanations or a series of numbers that can be very important and you need a voice that can really make its audience focus.
The audience for demonstrator voices certainly depends on what you are intending to present. It can be a broad consumer audience, or a very specific , niche one. It can be your executive board to whom you need to present latest technical reports which involve a number of graphs and images, or it can be an audio/video demonstration of how a certain machine, gadget or a vehicle works and what it features.
There are certain variations in demonstrator voices, that depend on the content of the presentation. It definitely needs to be distinctive and it needs to have a clear presentation. If you are introducing something for the first time, the tone has to be warm and thoughtful, while if it is a decisive sales push, ot has to heave deeper tone colorations that make an impression.