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Hi! It seems like you have understood me incorrectly - it's very usable all alone :D If you don't want a master controller (which can be mounted onto the pneumatic mod rail so it won't take any extra space) and know just a tiny bit about Arduinos, you can easily make it a standalone USB device.

Btw, the previous post was in 2018, the project has changed a lot since then. The current version is MKIV, the software was completely rewritten, look it up in simchair4_models and simchair4_software repo.