Free and Open Source Audio Programming Language

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ModulysCS

ModulysCS is built around ModulysVst which is a giant step-sequencer/phrase generator in Vst-plugin format. ModulysCS is a portable app for Windows (15MB zip-file) and includes a Csound CSD-editor.

You can create your own presets and instruments. It uses Csound 6.15.0 api for communication and sound generation.

It's totally free without restrictions.

For more info see
raxntrax website
modulyscs website