pngcmd="(./ps2png 512 512 /Users/jc/w/tmp/Tune-2556-PottenEndReel0.ps) >>/Users/jc/w/tmp/Tune-2556-get.log 2>&1" returned status 256
http://roaringjelly.org/~jc/Scotland/PottenEndReel0.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-2556-PottenEndReel0.abc 1692 ABC music file with the extracted tune(s)
Tune-2556-PottenEndReel0.ps 48490 PostScript
Tune-2556-PottenEndReel0.txt 1692 Plain-text file with the extracted tune(s)
Tune-2556-get.log 4914 Log file, useful mostly for debugging
These files should be available for 24 hours.