You buy the right to use the license for a single user by donating an amount of your own choice to either:
When you have donated, please send a mail to info @ shortestpath.se. Please write how much and to which organization you donated. One little sentence is enough, like "I gave 30 dollars to MSF".
By buying a license, you are entitled to free upgrades to future versions of DSoundTool.
There are many features that can be added to DSoundTool. But further development completely will depend on return on investment. You donate, we develop!