I found a freeware plugin mixer that works with cantabile. It’s called MixMaxTrix and it is a is a Virtual Effect Audio Plugin for Windows and Linux. It functions as a VST 3 Plugin. You can download from kvraudio https://www.kvraudio.com/product/mixmaxtrix-by-artv It has 8 channels and all kind of fx.
I know that some of you are searching for this kind of plugin, so here you are…