pngcmd="(./ps2png 512 512 /Users/jc/w/tmp/Tune-78946-KlezJam_Bb.ps) >>/Users/jc/w/tmp/Tune-78946-get.log 2>&1" returned status 256
http://roaringjelly.org/~jc/KC/KlezJam_Bb.abc

Error exit status 256; here are some files to check:
[P=tuneget V=1/1 B=0 scale=0.70 512x512 PNG]
filesizedescription
List78946.log 162 Log file, useful mostly for debugging
Tune-78946-KlezJam_Bb.abc 15971 ABC music file with the extracted tune(s)
Tune-78946-KlezJam_Bb.ps 210962 PostScript
Tune-78946-KlezJam_Bb.txt 15971 Plain-text file with the extracted tune(s)
Tune-78946-get.log 24344 Log file, useful mostly for debugging
These files should be available for 24 hours.