pngcmd="(./ps2png 512 512 /Users/jc/w/tmp/Tune-29513-Swift-Bm-32-3.ps) >>/Users/jc/w/tmp/Tune-29513-get.log 2>&1" returned status 256
http://john-chambers.us/~jc/music/abc/session/jig/Swift-Bm-32-3.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-29513-Swift-Bm-32-3.abc 503 ABC music file with the extracted tune(s)
Tune-29513-Swift-Bm-32-3.ps 35053 PostScript
Tune-29513-Swift-Bm-32-3.txt 503 Plain-text file with the extracted tune(s)
Tune-29513-get.log 4508 Log file, useful mostly for debugging
These files should be available for 24 hours.