I have many digitized vinyl records in my collection. Will iTunes match work with them?
I read in "troubleshooting" that some songs might not work with iTunes Match if quality is too low.
What does that mean?
Any track encoded with a bit-rate of 96 Kbps or lower is ineligble for iTunes Match. If you have any low bit-rate songs in your library you can right-click the song and choose "Create AAC Version."
There is a 200mb limit and songs that can go to the iCloud. How do I determine a song files' size?
Pull down View > View Options and select "size." This will add a column to your iTunes browser that will show you how large your music files are.
Will ALL of my music files still be available on my iMac after an iTunes
Match procedure? And will all of these be available on my iOS devices?
Yes and yes.
Search the forum here as there are a few about vinyl needledrop tests that some of us have done. The short answer is "don't expect 100% matching".