pngcmd="(./ps2png 512 512 /Users/jc/w/tmp/Tune-67467-Straight_Skillern.ps) >>/Users/jc/w/tmp/Tune-67467-get.log 2>&1" returned status 256
http://john-chambers.us/~jc/music/book/Straight_Skillern.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_67467.log 507725 Log file, useful mostly for debugging
Tune-67467-Straight_Skillern.abc 155712 ABC music file with the extracted tune(s)
Tune-67467-Straight_Skillern.ps 800057 PostScript
Tune-67467-Straight_Skillern.txt 155712 Plain-text file with the extracted tune(s)
Tune-67467-get.log 112322 Log file, useful mostly for debugging
These files should be available for 24 hours.