pngcmd="(./ps2png 512 512 /Users/jc/w/tmp/Tune-71674-Humahus-D-10-1.ps) >>/Users/jc/w/tmp/Tune-71674-get.log 2>&1" returned status 256
http://john-chambers.us/~jc/music/session/Oivan_Ilo/Humahus/Humahus-D-10-1.abc

Error exit status 256; here are some files to check:
[P=get.cgi V=1/1 B=0 scale=0.55 512x512 PNG]
filesizedescription
Tune-71674-Humahus-D-10-1.abc 401 ABC music file with the extracted tune(s)
Tune-71674-Humahus-D-10-1.ps 32778 PostScript
Tune-71674-Humahus-D-10-1.txt 401 Plain-text file with the extracted tune(s)
Tune-71674-get.log 4632 Log file, useful mostly for debugging
These files should be available for 24 hours.