Orastron has released a new version of the A-SID plugin with support for Windows, macOS (both Mac Intel and Apple Silicon), and Linux.
A-SID implements a wah effect as a C64 program and a VST3 plugin.
The C64 program uses the SID chip in the original machine. No hardware modification is required, but you need to build yourself one or two adapter cables and copy the program to a cassette.
The VST3 version emulates the original analog filter (the MOS 8580 version) and replicates the look and behavior of the C64 program.
Both versions are free and open source and available here.
The development process has also been documented in a series of blog posts.
