pngcmd="(./ps2png 512 512 /Users/jc/w/tmp/Tune-29680-028_la_Scimballe.ps) >>/Users/jc/w/tmp/Tune-29680-get.log 2>&1" returned status 256
http://john-chambers.us/~jc/music/book/Stewart/SCAJMR/028_la_Scimballe.abc

Error exit status 256; here are some files to check:
[P=tuneget V=1/1 B=0 scale=0.55 512x512 PNG]
filesizedescription
Form_29680.log 2014 Log file, useful mostly for debugging
Tune-29680-028_la_Scimballe.abc 522 ABC music file with the extracted tune(s)
Tune-29680-028_la_Scimballe.ps 33108 PostScript
Tune-29680-028_la_Scimballe.txt 522 Plain-text file with the extracted tune(s)
Tune-29680-get.log 4628 Log file, useful mostly for debugging
These files should be available for 24 hours.