neither Google nor this site will give me a straight answer...can I use my Altane writer to flash a 32M EMS multicart , like I could with the GB Transferer?

Yes. Here's a good thread on it: https://chipmusic.org/forums/topic/1311 … r-project/

I can't seem to find any mention of it in that thread. funny there isn't even  a readme packaged with the altane software. and the site sems to be down right now.

Here's an alternate site with info: https://www.retromodding.com/collection … 5489974305

It's supported.

There's some more information here as well. I'll poke nitro to add a support list directly to the page.