I had exactly the same problem as squealermusic above (crash on record action 
with "Assertion `dsp->fd < 0' failed").
Ubuntu 12.04 and Scratch 1.4 on IBM machine with Intel HDA integrated audio.

After a lot of troubleshooting I stumbled on the solution:
I picked up a driver from here:
http://voices.canonical.com/david.henningsson/2013/01/18/upcoming-changes-to-the-intel-hda-drivers/

... and replaced "-vm-sound-oss" with "-vm-sound-pulse" in file
"/usr/bin/scratch" (must be root for this).

I also had choppy sound before (meaw) and that was fixed with appending
" tsched=0" to this line "load-module module-udev-detect" in file
"/etc/pulse/default.pa" (+reboot).

See this topic for some alternative solutions:
http://askubuntu.com/questions/157891/skype-and-vlc-sounds-sizzle-distorted-bad

Scratch good.

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https://bugs.launchpad.net/bugs/1071497

Title:
  scratch crash at sound

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