pngcmd="(./ps2png 512 512 /Users/jc/w/tmp/Tune-8057-ChineseBreakdown.ps) >>/Users/jc/w/tmp/Tune-8057-get.log 2>&1" returned status 256
http://john-chambers.us/~jc/music/abc/Square/ChineseBreakdown.abc

Error exit status 256; here are some files to check:
[P=tuneget V=1/1 B=0 scale=0.70 512x512 PNG]
filesizedescription
Coll_80572.log 667895 Log file, useful mostly for debugging
Coll_80573.log 747103 Log file, useful mostly for debugging
Tune-8057-ChineseBreakdown.abc 532 ABC music file with the extracted tune(s)
Tune-8057-ChineseBreakdown.ps 34375 PostScript
Tune-8057-ChineseBreakdown.txt 532 Plain-text file with the extracted tune(s)
Tune-8057-get.log 4538 Log file, useful mostly for debugging
These files should be available for 24 hours.