I don't know when I will find time to finish a new release of the tuner tool. I've some new features partly written.
I tried the current build today in my N800 and seems to work as expected.
Chris Jones noticed me that there's a problem with the audiotestsrc gstreamer element which is not provided by default on N800. To solve this issue you should install the gstreamer0.10-plugins-base-extra package manually.