I love the number system, but I am having trouble transferring them into notes when my keyboard player yells them out. Help!
Just in case you (or anyone else) is struggling with this, the key is to learn your major scales. Whatever system you have of doing this, keep it up until you know them like the back of your hand.
I like to drill myself sometimes with major scales. I have a blank sheet of paper with the first note of each major scale listed. Then I time myself at how fast I can fill them in. I can list all 15 (12+3 enharmonics) in bout 5 minutes.