Enhancements    

Patents of Eric Freudenthal

Mr. Echo
Issue Date: 03 - 16 - 2021
Application Date: 02 - 08 - 2019
Patent No. 10,950,253

Apparatus and Method to Facilitate Singing Intended Notes
Issue Date: 09 - 26 - 2017
Application Date: 02 - 01 - 2016
Patent No. 9,773,426