Subliminal messaging

If I wanted to put a subliminal message onto an audio recording of, say, nothing, what sort of sound level would it have to be set at????

I�m interested in knowing how people�s perceptions to such things differ when the volume is slightly higher and/or lower.

Just try saying a couple normal sentences and put the hidden message between them..

The probem with your question, in my opinion, is that we DON"T want peole doing that. The chance for abuse is very great. We don't know who u work for or what y intend to do with the information. Maybe if u told us what u are going todo with it, we might be more responsive to your question.