Source code (JavaScript and sound files) https://github.com/goto920/
The following applications require Java Runtime Environment on your PC. They do not run on smartphones unless Java RE is installed (I have never heard). Download and run them on your PC.
Source code and details: https://github.com/goto920/java(Guitar Amp) <--------------------------------+ microphone | | | V | Audio I/O interface ---> small amp --> exciter (guitar) ^ | V PC (Win, macOS, or Linux with Java RE)