If you include the SetSoundLevel XCMD in one of your stacks, or use the SetSoundLevel Stack for your personal use (you have a trial period of 10 days if you decide to use the SetSoundLevel XCMD for the stack it comes with) you are required to pay the one time $5 shareware fee, which is per user, not per stack. One registered copy of SetSoundLevel allows the registered to implement it in as many stacks as he/she likes.
The SetSoundLevel stack may not be modified in any way, unless on a personal basis. But do not distribute (to, i.e., your friends...) modified versions of the stack or of the XCMD. If you do include the XCMD in a shareware/freeware/public domain stack, you must give me, Alex Rampell, credit, and say that your stack uses the SetSoundLevel XCMD, available on AOL.
Example:
This stack uses the shareware SetSoundLevel XCMD, by Alex Rampell.
That's all I request:)
Sorry for all that legal stuff!
The stack itself includes all of the online documentation you'll need.