Any question answered...

I have a feeling the recordable CDs labeled 'audio use' were made to work with audio devices that recorded sound direct to audio CDs - and that was the only benefit of that term being printed on the disc.

I think if your CD player won't play a disc made on a computer with a CD-R it won't work with an 'audio use' disc made in the same way either.

This is possible, I'm not 100% sure. Worth the cost of a CD-R to find out though, I guess.