How to get use Demucs to get only guitar stems, but with a LUA script?

[AnshulJ999]

Hey all, just tried UVR 5 and it's absolutely amazing. I can use Demucs htdemucs_6s model and then select the guitar stem to only get that output, which works fine within the app.

Just wanted to know how this is achieved, and how can I integrate into CLI for a LUA script? A noob here and I just want to have the same feature inside Reaper: I can use htdemucs_6s just fine, but I don't know how to get a two-stem version: Guitar and NoGuitar.

Is it merely recombining the other stems to get the NoGuitar version, or something else?

Also, the same model, htdemucs6s, seems to be much faster when run from UVR compared to running it from the LUA script or just in CLI. Like 5x faster. So how? Is there a way I can see which parameters are being used while running?

Thanks!