WebAudio is a recent W3C API that brings the world of computer music applications into the browser. While JavaScript and Web standards are increasingly flexible and powerful, C/C++ has been the language of choice for real-time audio applications and domain specific languages such as FAUST facilitate rapid development with high performance. We present here a host Web application-the Pedal Board project-as well as plugins (instruments, effects), written in JavaScript, ported from C/C++, or written using Domain Specific Languages such as FAUST, and compiled to the new WebAssembly binary standard that can be executed by recent Web browsers. These plugins follow an open standard we are developing.