pngcmd="(./ps2png 512 512 /Users/jc/w/tmp/Tune-5538-078_la_Piere_Fritoisse.ps) >>/Users/jc/w/tmp/Tune-5538-get.log 2>&1" returned status 256
http://john-chambers.us/~jc/music/book/Stewart/SCAJMR/078_la_Piere_Fritoisse.abc

Error exit status 256; here are some files to check:
[P=tuneget V=1/1 B=0 scale=0.55 512x512 PNG]
filesizedescription
Coll_55382.log 450011 Log file, useful mostly for debugging
Coll_55385.log 452811 Log file, useful mostly for debugging
Tune-5538-078_la_Piere_Fritoisse.abc 670 ABC music file with the extracted tune(s)
Tune-5538-078_la_Piere_Fritoisse.ps 34940 PostScript
Tune-5538-078_la_Piere_Fritoisse.txt 670 Plain-text file with the extracted tune(s)
Tune-5538-get.log 4773 Log file, useful mostly for debugging
These files should be available for 24 hours.