Got HTTP status 404 Not Found for "http://roaringjelly.org/~jc/music/book/Potpourri/BB50.abc"
pngcmd="(./ps2png 512 512 /Users/jc/w/tmp/Tune-8385-BB50.ps) >>/Users/jc/w/tmp/Tune-8385-get.log 2>&1" returned status 256
http://roaringjelly.org/~jc/music/book/Potpourri/BB50.abc

Error exit status 256; here are some files to check:
[P=tuneget V=1/1 B=0 scale=0.70 512x512 PNG]
filesizedescription
Sess-83852.log 11713 Log file, useful mostly for debugging
Tune-8385-BB50.abc 146 ABC music file with the extracted tune(s)
Tune-8385-BB50.ps 6 PostScript
Tune-8385-BB50.txt 146 Plain-text file with the extracted tune(s)
Tune-8385-get.log 3970 Log file, useful mostly for debugging
Tune-83850-MouseInTheCupboard.abc 0 ABC music file with the extracted tune(s)
Tune-83850-MouseInTheCupboard.txt 0 Plain-text file with the extracted tune(s)
Tune-83850-get.log 8137 Log file, useful mostly for debugging
Tune-83851-get.log 4971 Log file, useful mostly for debugging
Tune-83852-get.log 2974 Log file, useful mostly for debugging
Tune-83854-HibernianMuse-V1.abc 154 ABC music file with the extracted tune(s)
Tune-83854-HibernianMuse-V1.pdf 2217 Portable Data Format
Tune-83854-HibernianMuse-V1.ps 6 PostScript
Tune-83854-HibernianMuse-V1.txt 154 Plain-text file with the extracted tune(s)
Tune-83854-get.log 5060 Log file, useful mostly for debugging
Tune-83859-get.log 5430 Log file, useful mostly for debugging
These files should be available for 24 hours.