Last week a reader pointed out that after buying the Mundelein psalter (on my recommendation) and going to their website to look up the (recommended by me) audio files of psalm tones for chanting, they weren't there.
I verified this terrible loss to all would-be amateur chanters, and wrote to Fr. Martis (author/editor of the Psalter) for an explanation. Here is what came back today:
Thank you for your note.
The University has been migrating to a new website. Consequently all of our pages have been affected.
We have been trying to resolve the issues.
I will contact you when I have more information.
Sorry for the inconvenience.
So that sounds hopeful. We should have those audio files back sooner or later.