pngcmd="(./ps2png 512 512 /Users/jc/w/tmp/Tune-34793-Aird_vol1_abc2.ps) >>/Users/jc/w/tmp/Tune-34793-get.log 2>&1" returned status 256
http://john-chambers.us/~jc/music/book/Aird/Aird_vol1_abc2.abc

Error exit status 256; here are some files to check:
[get.cgi V=1/1 B=0 scale=0.55 512x512 PNG]
filesizedescription
Form_34793.log 813 Log file, useful mostly for debugging
Tune-34793-Aird_vol1_abc2.abc 66527 ABC music file with the extracted tune(s)
Tune-34793-Aird_vol1_abc2.ps 862168 PostScript
Tune-34793-Aird_vol1_abc2.txt 66527 Plain-text file with the extracted tune(s)
Tune-34793-get.log 185710 Log file, useful mostly for debugging
These files should be available for 24 hours.