Audio by choice

I am very interested in audio on demand in which the surfer has a choice
whether to hear audio by clicking a button; it is not automatic, so the
bandwidth problem is not an issue for surfers who have a problem with
streaming audio - they just don't click on the button.

Here are the sources for Flash encoding programs that make the process
simple:

http://www.audiogenerator.com
http://www.sonicememo.com
http://www.mp3soundstream.com
http://www.mywebsitetalks.com
http://www.soundnails.com
http://www.instantaudio.com
http://www.audiomakerpro.com

I purchased Audiomaker Pro, but while I am impressed with its
simplicity, I am not impressed with the quality of the audio output. The
bitrate is too low for my tastes, and I do not see a way to increase the
bitrate of the Flash converter, which I know nothing about.

Upon further research, it appears that the program from soundnails.com
allows a choice of quality. Since I am not familiar with Flash and with
the technologies these programs use to create the audio, I am hoping
that someone here WITH this knowledge will explain the differences to
me. I really don't want to waste money on another program, so I am
trying to do some homework.

I do believe that audio on demand is viable using these technologies.
Again, if the surfer does not want to hear the audio, s/he doesn't click
on the button. No harm done.