Got HTTP status 404 Not Found for "http://john-chambers.us/~jc/music/book/Kerr_MM/AMHSI_abc1.abc"
pngcmd="(./ps2png 512 512 /Users/jc/w/tmp/Tune-3305-AMHSI_abc1.ps) >>/Users/jc/w/tmp/Tune-3305-get.log 2>&1" returned status 256
http://john-chambers.us/~jc/music/book/Kerr_MM/AMHSI_abc1.abc

Error exit status 256; here are some files to check:
[P=tuneget V=1/1 B=0 scale=0.70 512x512 PNG]
filesizedescription
Coll_3305.log 579900 Log file, useful mostly for debugging
Coll_33054.log 285735 Log file, useful mostly for debugging
Coll_33055.log 284330 Log file, useful mostly for debugging
Coll_33058.log 855800 Log file, useful mostly for debugging
Tune-3305-AMHSI_abc1.abc 150 ABC music file with the extracted tune(s)
Tune-3305-AMHSI_abc1.ps 6 PostScript
Tune-3305-AMHSI_abc1.txt 150 Plain-text file with the extracted tune(s)
Tune-3305-get.log 8996 Log file, useful mostly for debugging
Tune-33051-get.log 1418 Log file, useful mostly for debugging
Tune-33056-get.log 1392 Log file, useful mostly for debugging
Tune-33058-get.log 6234 Log file, useful mostly for debugging
These files should be available for 24 hours.