pngcmd="(./ps2png 512 512 /Users/jc/w/tmp/Tune-3961-Pwt_Ar_y_Bys.ps) >>/Users/jc/w/tmp/Tune-3961-get.log 2>&1" returned status 256
http://john-chambers.us/~jc/music/abc/hornpipe/Pwt_Ar_y_Bys.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_39614.log 153123 Log file, useful mostly for debugging
Coll_39615.log 142802 Log file, useful mostly for debugging
Tune-3961-Pwt_Ar_y_Bys.abc 450 ABC music file with the extracted tune(s)
Tune-3961-Pwt_Ar_y_Bys.ps 32908 PostScript
Tune-3961-Pwt_Ar_y_Bys.txt 450 Plain-text file with the extracted tune(s)
Tune-3961-get.log 4452 Log file, useful mostly for debugging
Tune-39619-get.log 4135 Log file, useful mostly for debugging
These files should be available for 24 hours.