pngcmd="(./ps2png 512 512 /Users/jc/w/tmp/Tune-60857-CSGBT_1794-V1.ps) >>/Users/jc/w/tmp/Tune-60857-get.log 2>&1" returned status 256
http://john-chambers.us/~jc/music/book/CSGBT_1794-V1.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_60857.log 635580 Log file, useful mostly for debugging
Sess-60857.log 104335428 Log file, useful mostly for debugging
Tune-60857-CSGBT_1794-V1.abc 7590 ABC music file with the extracted tune(s)
Tune-60857-CSGBT_1794-V1.ps 116018 PostScript
Tune-60857-CSGBT_1794-V1.txt 7590 Plain-text file with the extracted tune(s)
Tune-60857-get.log 14821 Log file, useful mostly for debugging
These files should be available for 24 hours.