pngcmd="(./ps2png 512 512 /Users/jc/w/tmp/Tune-4292-sep.ps) >>/Users/jc/w/tmp/Tune-4292-get.log 2>&1" returned status 256
http://roaringjelly.org/~jc/scand/sep.abc

Error exit status 256; here are some files to check:
[P=tuneget V=1/1 B=0 scale=0.70 512x512 PNG]
filesizedescription
Coll_4292.log 275901 Log file, useful mostly for debugging
Coll_42921.log 135064 Log file, useful mostly for debugging
Coll_42924.log 257636 Log file, useful mostly for debugging
Coll_42926.log 451526 Log file, useful mostly for debugging
Form_42924.log 1077 Log file, useful mostly for debugging
Form_42928.log 882 Log file, useful mostly for debugging
Tune-4292-get.log 48100 Log file, useful mostly for debugging
Tune-4292-sep.abc 14 ABC music file with the extracted tune(s)
Tune-4292-sep.ps 30461 PostScript
Tune-4292-sep.txt 14 Plain-text file with the extracted tune(s)
Tune-42920-get.log 5470 Log file, useful mostly for debugging
Tune-42923-get.log 4051 Log file, useful mostly for debugging
Tune-42924-get.log 4274 Log file, useful mostly for debugging
Tune-42925-get.log 4095 Log file, useful mostly for debugging
Tune-42927-get.log 44846 Log file, useful mostly for debugging
Tune-42929-get.log 1393 Log file, useful mostly for debugging
These files should be available for 24 hours.