pngcmd="(./ps2png 512 512 /Users/jc/w/tmp/Tune-4870-allans.ps) >>/Users/jc/w/tmp/Tune-4870-get.log 2>&1" returned status 256
http://montrealsession.cechire.com/assets/abc/allans.abc

Error exit status 256; here are some files to check:
[P=get.cgi V=1/1 B=0 scale=0.60 512x512 PNG]
filesizedescription
Coll_48702.log 256329 Log file, useful mostly for debugging
Coll_48707.log 129497 Log file, useful mostly for debugging
Tune-4870-allans.abc 706 ABC music file with the extracted tune(s)
Tune-4870-allans.ps 37968 PostScript
Tune-4870-allans.txt 706 Plain-text file with the extracted tune(s)
Tune-4870-get.log 4285 Log file, useful mostly for debugging
Tune-48702-get.log 3411 Log file, useful mostly for debugging
These files should be available for 24 hours.