pngcmd="(./ps2png 512 512 /Users/jc/w/tmp/Tune-84875-session.ps) >>/Users/jc/w/tmp/Tune-84875-get.log 2>&1" returned status 256
http://john-chambers.us/~jc/Ireland/session.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-84875-get.log 63092 Log file, useful mostly for debugging
Tune-84875-session.abc 58306 ABC music file with the extracted tune(s)
Tune-84875-session.ps 655739 PostScript
Tune-84875-session.txt 58306 Plain-text file with the extracted tune(s)
These files should be available for 24 hours.