I listened to chapters 40 and 50. Both are fine aurally, but when I ran them through "Checker", they appear to be recorded at 320 kbps rather than the standard of 128 kbps.
While you work on those, with your permission, I'll go ahead and do 60 and 63, next.
I'll spot PL 40 and 50 whenever you tell me they're ready.
Let me know,
"People don't care how much you know, until they know how much you care." - attributed to Theodore Roosevelt