pngcmd="(./ps2png 512 512 /Users/jc/w/tmp/Tune-77490-1101_PROMENADE_QUICK-STEP.ps) >>/Users/jc/w/tmp/Tune-77490-get.log 2>&1" returned status 256
http://john-chambers.us/~jc/music/book/BostonCollection/1101_PROMENADE_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
Coll_77490.log 1381689 Log file, useful mostly for debugging
Form_77490.log 188 Log file, useful mostly for debugging
Tune-77490-1101_PROMENADE_QUICK-STEP.abc 919 ABC music file with the extracted tune(s)
Tune-77490-1101_PROMENADE_QUICK-STEP.ps 39011 PostScript
Tune-77490-1101_PROMENADE_QUICK-STEP.txt 919 Plain-text file with the extracted tune(s)
Tune-77490-get.log 8894 Log file, useful mostly for debugging
These files should be available for 24 hours.