Good to know: Ubuntu studio comes with RaySession, a software that allows to save a soft·hard·ware / midi / anything… patch and load it when you want to find back a precise configuration for your live. It also solves lots of trouble if you work with a web browser as a source, as it autoconnects audio contexts to your preferred destination. Thanks to @QuentinJuhel@post.lurk.org for finding that. Obviously you can download RaySession even if you don’t use Ubuntu Studio.