pngcmd="(./ps2png 512 512 /Users/jc/w/tmp/Tune-39779-10791_MISS_GRACE_MENZIES_STRATHSPEY.ps) >>/Users/jc/w/tmp/Tune-39779-get.log 2>&1" returned status 256
http://roaringjelly.org/~jc/music/book/Kohlers/10791_MISS_GRACE_MENZIES_STRATHSPEY.abc

Error exit status 256; here are some files to check:
[P=tuneget V=1/1 B=0 scale=0.70 512x512 PNG]
filesizedescription
Form_39779.log 966 Log file, useful mostly for debugging
Tune-39779-10791_MISS_GRACE_MENZIES_STRATHSPEY.abc 699 ABC music file with the extracted tune(s)
Tune-39779-10791_MISS_GRACE_MENZIES_STRATHSPEY.ps 39536 PostScript
Tune-39779-10791_MISS_GRACE_MENZIES_STRATHSPEY.txt 699 Plain-text file with the extracted tune(s)
Tune-39779-get.log 5082 Log file, useful mostly for debugging
These files should be available for 24 hours.