Got HTTP status 404 Not Found for "http://roaringjelly.org/~jc/music/book/1798/blank.abc"
pngcmd="(./ps2png 512 512 /Users/jc/w/tmp/Tune-4023-blank.ps) >>/Users/jc/w/tmp/Tune-4023-get.log 2>&1" returned status 256
http://roaringjelly.org/~jc/music/book/1798/blank.abc

Error exit status 256; here are some files to check:
[P=tuneget V=1/1 B=0 scale=0.70 512x512 PNG]
filesizedescription
Tune-4023-blank.abc 142 ABC music file with the extracted tune(s)
Tune-4023-blank.ps 6 PostScript
Tune-4023-blank.txt 142 Plain-text file with the extracted tune(s)
Tune-4023-get.log 3963 Log file, useful mostly for debugging
Tune-40230-Kerr_MM4-V1.abc 148 ABC music file with the extracted tune(s)
Tune-40230-Kerr_MM4-V1.ps 6 PostScript
Tune-40230-Kerr_MM4-V1.txt 148 Plain-text file with the extracted tune(s)
Tune-40230-get.log 4016 Log file, useful mostly for debugging
Tune-40235-21001_Franklin_Sett_tune_1.abc 955 ABC music file with the extracted tune(s)
Tune-40235-21001_Franklin_Sett_tune_1.gif 0 Graphics Interchange Format, the proprietary scan-line picture format
Tune-40235-21001_Franklin_Sett_tune_1.ps 35708 PostScript
Tune-40235-21001_Franklin_Sett_tune_1.txt 955 Plain-text file with the extracted tune(s)
Tune-40235-get.log 5802 Log file, useful mostly for debugging
These files should be available for 24 hours.