Beta 3 has been posted.
Changes:
Added help button for SoX path
Added handler to clear SoX and player paths if user selects cancel when browsing for executable.
Packaged .msi into .exe file as IE finds .msi indigestible even though it’s a Microsoft installer. 
2011-12-30 07:15, new build uploaded. Same version, 32 bit compatible installer. Thanks to Martin C. for reporting the problem with the packager.