Maybe I’m a bit late, but here is a more flexible tool for rendering particular slots/patterns/song: https://forum.renoise.com/t/render-selected-patterns-to-sample/46862
To render a song, hit ctrl-a in the PM and “Render Selected Slots to Sample”.
Joule, if you have some spare minutes sometime, it would be great if you could make a post with links to all your forum-only tools and put it in your signature (i.e. like “My Scripts On Forum” in mine).
You`d be doing us a great service! 