Got HTTP status 404 Not Found for "http://roaringjelly.org/~jc/music/book/1794/George_Meikle.abc"
pngcmd="(./ps2png 512 512 /Users/jc/w/tmp/Tune-9630-George_Meikle.ps) >>/Users/jc/w/tmp/Tune-9630-get.log 2>&1" returned status 256
http://roaringjelly.org/~jc/music/book/1794/George_Meikle.abc

Error exit status 256; here are some files to check:
[P=tuneget V=1/1 B=0 scale=0.70 512x512 PNG]
filesizedescription
Form_96304.log 825 Log file, useful mostly for debugging
Tune-9630-George_Meikle.abc 150 ABC music file with the extracted tune(s)
Tune-9630-George_Meikle.ps 6 PostScript
Tune-9630-George_Meikle.txt 150 Plain-text file with the extracted tune(s)
Tune-9630-get.log 4125 Log file, useful mostly for debugging
Tune-96300-get.log 28648 Log file, useful mostly for debugging
Tune-96302-095_Come_Thou_Almighty_King.abc 1104 ABC music file with the extracted tune(s)
Tune-96302-095_Come_Thou_Almighty_King.txt 1104 Plain-text file with the extracted tune(s)
Tune-96302-get.log 3541 Log file, useful mostly for debugging
Tune-96303-get.log 3163 Log file, useful mostly for debugging
These files should be available for 24 hours.