pngcmd="(./ps2png 512 512 /Users/jc/w/tmp/Tune-7933-CaptainMacDonaldsFancy.ps) >>/Users/jc/w/tmp/Tune-7933-get.log 2>&1" returned status 256
http://john-chambers.us/~jc/Scotland/CaptainMacDonaldsFancy.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_7933.log 273090 Log file, useful mostly for debugging
Coll_79335.log 229 Log file, useful mostly for debugging
Coll_79337.log 720379 Log file, useful mostly for debugging
Tune-7933-CaptainMacDonaldsFancy.abc 1887 ABC music file with the extracted tune(s)
Tune-7933-CaptainMacDonaldsFancy.ps 44921 PostScript
Tune-7933-CaptainMacDonaldsFancy.txt 1887 Plain-text file with the extracted tune(s)
Tune-7933-get.log 5170 Log file, useful mostly for debugging
Tune-79332-get.log 1383 Log file, useful mostly for debugging
These files should be available for 24 hours.