pngcmd="(./ps2png 512 512 /Users/jc/w/tmp/Tune-16273-1012_IRON_BOOTS_QUICK-STEP.ps) >>/Users/jc/w/tmp/Tune-16273-get.log 2>&1" returned status 256
http://john-chambers.us/~jc/music/book/BostonCollection/1012_IRON_BOOTS_QUICK-STEP.abc

Error exit status 256; here are some files to check:
[P=tuneget V=1/1 B=0 scale=0.70 512x512 PNG]
filesizedescription
Tune-16273-1012_IRON_BOOTS_QUICK-STEP.abc 1097 ABC music file with the extracted tune(s)
Tune-16273-1012_IRON_BOOTS_QUICK-STEP.ps 38714 PostScript
Tune-16273-1012_IRON_BOOTS_QUICK-STEP.txt 1097 Plain-text file with the extracted tune(s)
Tune-16273-get.log 4913 Log file, useful mostly for debugging
These files should be available for 24 hours.