Got HTTP status 404 Not Found for "http://roaringjelly.org/~jc/music/book/1799/dim.abc"
pngcmd="(./ps2png 512 512 /Users/jc/w/tmp/Tune-4422-dim.ps) >>/Users/jc/w/tmp/Tune-4422-get.log 2>&1" returned status 256
http://roaringjelly.org/~jc/music/book/1799/dim.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_44221.log 954 Log file, useful mostly for debugging
Form_44229.log 931 Log file, useful mostly for debugging
Tune-4422-dim.abc 140 ABC music file with the extracted tune(s)
Tune-4422-dim.ps 6 PostScript
Tune-4422-dim.txt 140 Plain-text file with the extracted tune(s)
Tune-4422-get.log 8198 Log file, useful mostly for debugging
Tune-44223-alltunes1.abc 37990 ABC music file with the extracted tune(s)
Tune-44223-alltunes1.gif 0 Graphics Interchange Format, the proprietary scan-line picture format
Tune-44223-alltunes1.ps 267511 PostScript
Tune-44223-alltunes1.txt 37990 Plain-text file with the extracted tune(s)
Tune-44223-get.log 20655 Log file, useful mostly for debugging
Tune-44229-get.log 5511 Log file, useful mostly for debugging
These files should be available for 24 hours.