pngcmd="(./ps2png 512 512 /Users/jc/w/tmp/Tune-9464-0763_JOHNNY_PRINGLE_A_STRATHSPEY.ps) >>/Users/jc/w/tmp/Tune-9464-get.log 2>&1" returned status 256
http://john-chambers.us/~jc/music/book/BostonCollection/0763_JOHNNY_PRINGLE_A_STRATHSPEY.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_94640.log 1204428 Log file, useful mostly for debugging
Coll_94643.log 263810 Log file, useful mostly for debugging
Coll_94647.log 457007 Log file, useful mostly for debugging
Coll_94648.log 473810 Log file, useful mostly for debugging
Tune-9464-0763_JOHNNY_PRINGLE_A_STRATHSPEY.abc 653 ABC music file with the extracted tune(s)
Tune-9464-0763_JOHNNY_PRINGLE_A_STRATHSPEY.ps 35918 PostScript
Tune-9464-0763_JOHNNY_PRINGLE_A_STRATHSPEY.txt 653 Plain-text file with the extracted tune(s)
Tune-9464-get.log 5069 Log file, useful mostly for debugging
Tune-94643-get.log 5598 Log file, useful mostly for debugging
Tune-94649-get.log 5627 Log file, useful mostly for debugging
These files should be available for 24 hours.