Midwest Airlines Midwest Miles (Pre-Alignment) - Voucher for Miles?

I have a Travel Voucher for unused travel that I keep windling down (but after three trips I still have a good amount left). Anyway, I am wondering if I can use it to buy addtl Miles.
I cannot call from work, and tried searching on the YX site, but could not find any info on it. And of course the Live Chat is not working for me.

Thanks!

I am not aware of any mechanism that lets you do this, but a call to the Midwest Miles service desk can't hurt.

Let us know if anything comes of it.

I was finally able to call YX. The answer is no. Not surprising, but unfortunate for me.