pngcmd="(./ps2png 512 512 /Users/jc/w/tmp/Tune-86456-291_MissDallassStrathspey.ps) >>/Users/jc/w/tmp/Tune-86456-get.log 2>&1" returned status 256
http://john-chambers.us/~jc/music/book/Pringle/291_MissDallassStrathspey.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_86456.log 820 Log file, useful mostly for debugging
Tune-86456-291_MissDallassStrathspey.abc 701 ABC music file with the extracted tune(s)
Tune-86456-291_MissDallassStrathspey.ps 38028 PostScript
Tune-86456-291_MissDallassStrathspey.txt 701 Plain-text file with the extracted tune(s)
Tune-86456-get.log 4820 Log file, useful mostly for debugging
These files should be available for 24 hours.