sorry guys :-( i don't currently expose the frequency setting to the user.
the reason is that it originally played very frequently, and would get so annoying that users just turn music off in their client while on the server.
by reducing the frequency we found the new track integrated more into the existing game atmosphere.
if you would like to experiment with that setting, you can edit the lua file and let me know a value you are happier with - just beware it takes a long time to test and be aware of how 'annoying' the new value can become.
