pngcmd="(./ps2png 512 512 /Users/jc/w/tmp/Tune-47518-Humahus-D-10-1.ps) >>/Users/jc/w/tmp/Tune-47518-get.log 2>&1" returned status 256
http://roaringjelly.org/~jc/music/session/Oivan_Ilo/Humahus/Humahus-D-10-1.abc

Error exit status 256; here are some files to check:
[get.cgi V=1/1 B=0 scale=0.65 512x512 PNG]
filesizedescription
Form_47518.log 872 Log file, useful mostly for debugging
Tune-47518-Humahus-D-10-1.abc 401 ABC music file with the extracted tune(s)
Tune-47518-Humahus-D-10-1.ps 33071 PostScript
Tune-47518-Humahus-D-10-1.txt 401 Plain-text file with the extracted tune(s)
Tune-47518-get.log 4591 Log file, useful mostly for debugging
These files should be available for 24 hours.