pngcmd="(./ps2png 512 512 /Users/jc/w/tmp/Tune-7896-waltzes.ps) >>/Users/jc/w/tmp/Tune-7896-get.log 2>&1" returned status 256
http://montrealsession.cechire.com/assets/abc/waltzes.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_78960.log 260559 Log file, useful mostly for debugging
Coll_78966.log 263379 Log file, useful mostly for debugging
Coll_78969.log 260559 Log file, useful mostly for debugging
Tune-7896-get.log 4227 Log file, useful mostly for debugging
Tune-7896-waltzes.abc 280 ABC music file with the extracted tune(s)
Tune-7896-waltzes.ps 34017 PostScript
Tune-7896-waltzes.txt 280 Plain-text file with the extracted tune(s)
Tune-78964-get.log 6111 Log file, useful mostly for debugging
Tune-78965-get.log 2439 Log file, useful mostly for debugging
These files should be available for 24 hours.