pngcmd="(./ps2png 512 512 /Users/jc/w/tmp/Tune-86101-21403_MISS_STEWART_MENZIES_STRATHSPEY.ps) >>/Users/jc/w/tmp/Tune-86101-get.log 2>&1" returned status 256
http://john-chambers.us/~jc/music/book/Kohlers/21403_MISS_STEWART_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
Coll_86101.log 277807 Log file, useful mostly for debugging
Tune-86101-21403_MISS_STEWART_MENZIES_STRATHSPEY.abc 697 ABC music file with the extracted tune(s)
Tune-86101-21403_MISS_STEWART_MENZIES_STRATHSPEY.ps 39384 PostScript
Tune-86101-21403_MISS_STEWART_MENZIES_STRATHSPEY.txt 697 Plain-text file with the extracted tune(s)
Tune-86101-get.log 5263 Log file, useful mostly for debugging
These files should be available for 24 hours.