If the sound quality is low then the WAV will be small. But if you convert that to a constant bit-rate MP3 it will be larger. For example a WAV at 8,000 Hz 8-bit mono is about 470 KB per minute, but convert that to a constant bit-rate 128 Kb/sec MP3 and you're back up to 937 KB per minute. Basically, you just cut the quality more and wasted a lot of space.
OK, I give up, but thanks for the info.
I enjoy what I have and use and that’s all that’s important to me. If I were “20 something” again, I might be more finicky.