[Freeswitch-users] Handling US and UK English with say application

Hi I currently have a lua script which is reading out an account balance like this: session:execute("say", "en number pronounced 12345"); I have 2 sets of sound files, one for US english and another for UK english, however the say application only appears to allow one directory to be configured for "en" and I can't see any way of modifying this on the fly so I can switch between sound files for each user. Does anybody know of a solution to this? Pete