[Asterisk-Users] MOH Mixing tool

[Ernest W. Lessenger]

Does anyone know of a command-line tool that I can use to mix my own MOH 
tracks? Specifically, I want to be able to do this:

1) Record a "Your call is valuable to us..." advertisement
2) Specify a number of song files to be played randomly/in sequence/whatever
3) Insert or overlay the advertisement every n seconds

I would like this to be done live (via a configuration file) if possible, 
but I'd be just as happy to build a 60 minute mp3 file if it gets the job done.

Thanks,
--Ernest