pngcmd="(./ps2png 512 512 /Users/jc/w/tmp/Tune-2176-PubCrawl.ps) >>/Users/jc/w/tmp/Tune-2176-get.log 2>&1" returned status 256
http://john-chambers.us/~jc/Scotland/PubCrawl.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_21761.log 292760 Log file, useful mostly for debugging
Coll_21766.log 284330 Log file, useful mostly for debugging
Tune-2176-PubCrawl.abc 2020 ABC music file with the extracted tune(s)
Tune-2176-PubCrawl.ps 47673 PostScript
Tune-2176-PubCrawl.txt 2020 Plain-text file with the extracted tune(s)
Tune-2176-get.log 4736 Log file, useful mostly for debugging
These files should be available for 24 hours.