pngcmd="(./ps2png 512 512 /Users/jc/w/tmp/Tune-8024-ArthursSeatWaltzes.ps) >>/Users/jc/w/tmp/Tune-8024-get.log 2>&1" returned status 256
http://john-chambers.us/~jc/music/book/ArthursSeatWaltzes.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_80247.log 938174 Log file, useful mostly for debugging
Coll_80248.log 538635 Log file, useful mostly for debugging
Tune-8024-ArthursSeatWaltzes.abc 2638 ABC music file with the extracted tune(s)
Tune-8024-ArthursSeatWaltzes.ps 53629 PostScript
Tune-8024-ArthursSeatWaltzes.txt 2638 Plain-text file with the extracted tune(s)
Tune-8024-get.log 5657 Log file, useful mostly for debugging
These files should be available for 24 hours.