pngcmd="(./ps2png 512 512 /Users/jc/w/tmp/Tune-8240-Davids_Jig-Gm-32-4.ps) >>/Users/jc/w/tmp/Tune-8240-get.log 2>&1" returned status 256
http://john-chambers.us/~jc/music/abc/session/jig/Davids_Jig-Gm-32-4.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_82408.log 305405 Log file, useful mostly for debugging
Form_82404.log 778 Log file, useful mostly for debugging
Tune-8240-Davids_Jig-Gm-32-4.abc 643 ABC music file with the extracted tune(s)
Tune-8240-Davids_Jig-Gm-32-4.ps 37233 PostScript
Tune-8240-Davids_Jig-Gm-32-4.txt 643 Plain-text file with the extracted tune(s)
Tune-8240-get.log 4611 Log file, useful mostly for debugging
These files should be available for 24 hours.