pngcmd="(./ps2png 512 512 /Users/jc/w/tmp/Tune-30156-049_Air_in_Fortunatus.ps) >>/Users/jc/w/tmp/Tune-30156-get.log 2>&1" returned status 256
http://john-chambers.us/~jc/music/book/Stewart/SCAJMR/049_Air_in_Fortunatus.abc

Error exit status 256; here are some files to check:
[P=tuneget V=1/1 B=0 scale=0.55 512x512 PNG]
filesizedescription
Tune-30156-019_Cliff-001.svg 28199 Scalable Vector Graphics format
Tune-30156-019_Cliff.abc 757 ABC music file with the extracted tune(s)
Tune-30156-019_Cliff.txt 757 Plain-text file with the extracted tune(s)
Tune-30156-049_Air_in_Fortunatus.abc 648 ABC music file with the extracted tune(s)
Tune-30156-049_Air_in_Fortunatus.ps 35756 PostScript
Tune-30156-049_Air_in_Fortunatus.txt 648 Plain-text file with the extracted tune(s)
Tune-30156-get.log 8882 Log file, useful mostly for debugging
These files should be available for 24 hours.