Lobo, Continuous Tuning is free.

This software is distributed under the terms of the GNU General Public License (GPL), as published by the Free Software Foundation (FSF). In short, this means that you may freely redistribute the program, modified or as is, on the condition that you make the complete source code available as well. If you develop a program that is linked with "Lobo, Continuous Tuning", the program as a whole has to be distributed at no charge under the GPL.