Got HTTP status 404 Not Found for "http://roaringjelly.org/~jc/music/book/1792/dim.abc"
pngcmd="(./ps2png 512 512 /Users/jc/w/tmp/Tune-6734-dim.ps) >>/Users/jc/w/tmp/Tune-6734-get.log 2>&1" returned status 256
http://roaringjelly.org/~jc/music/book/1792/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_67342.log 1132 Log file, useful mostly for debugging
Tune-6734-dim.abc 140 ABC music file with the extracted tune(s)
Tune-6734-dim.ps 6 PostScript
Tune-6734-dim.txt 140 Plain-text file with the extracted tune(s)
Tune-6734-get.log 5441 Log file, useful mostly for debugging
Tune-67340-get.log 5548 Log file, useful mostly for debugging
Tune-67342-EverydaySongBook2.abc 154 ABC music file with the extracted tune(s)
Tune-67342-EverydaySongBook2.pdf 2217 Portable Data Format
Tune-67342-EverydaySongBook2.ps 6 PostScript
Tune-67342-EverydaySongBook2.txt 154 Plain-text file with the extracted tune(s)
Tune-67342-get.log 5085 Log file, useful mostly for debugging
Tune-67343-get.log 4306 Log file, useful mostly for debugging
Tune-67347-get.log 1383 Log file, useful mostly for debugging
These files should be available for 24 hours.