I confirm your high pitch symptoms for Squeak 1.13u on SqueakJS, but I am not
able to test 1.13u on the interpreter VM. It runs and browsers work, but I
cannot evaluate an expression in a workspace. This seems to be the case for
images earlier than Squeak 1.31 so something is still broken for the interpreter
VM for Squeak 1.23 and earlier. The issue seems to be related to something that
changed between Squeak 1.23 and Squeak 1.31.

Sound issues aside, if you want to do any serious work on a Squeak 1.13u image
I still recommend using SqueakJS :-)