Got HTTP status 404 Not Found for "http://roaringjelly.org/~jc/music/book/1779/cresc.abc"
pngcmd="(./ps2png 512 512 /Users/jc/w/tmp/Tune-63717-cresc.ps) >>/Users/jc/w/tmp/Tune-63717-get.log 2>&1" returned status 256
http://roaringjelly.org/~jc/music/book/1779/cresc.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-63717-Auchinellan_Jig.abc 1177 ABC music file with the extracted tune(s)
Tune-63717-Auchinellan_Jig.pdf 28594 Portable Data Format
Tune-63717-Auchinellan_Jig.ps 38499 PostScript
Tune-63717-Auchinellan_Jig.txt 1177 Plain-text file with the extracted tune(s)
Tune-63717-ShoresTrumpetTune_PLFD1698_389-001.svg 10742 Scalable Vector Graphics format
Tune-63717-ShoresTrumpetTune_PLFD1698_389.abc 358 ABC music file with the extracted tune(s)
Tune-63717-ShoresTrumpetTune_PLFD1698_389.txt 358 Plain-text file with the extracted tune(s)
Tune-63717-cresc.abc 142 ABC music file with the extracted tune(s)
Tune-63717-cresc.ps 6 PostScript
Tune-63717-cresc.txt 142 Plain-text file with the extracted tune(s)
Tune-63717-get.log 14061 Log file, useful mostly for debugging
These files should be available for 24 hours.