This sketch was exported out of software from http://www.synthmaker.co.uk
this program can produce sinewaves at extreme frequencies that possibly blow up your speaker and/or damage your ears. watch volumes.
License: 
this is "use-and-modify-at-own-risk-as-you-like-preferrably-with-common-sense" regarding the concept and usage of this dll to render signals + "no-selling-or-any-form-of-redistribution" regarding the dll file.