PyTTSX problem with GTK and threading

ttsxtest.py

import threading
import pyttsx
import objc
from Foundation import *
from PyObjCTools import AppHelper
import gobject

shouldUseThreads = True

if shouldUseThreads:
    import gtk
    gobject.threads_init()

class Test:
    def __init__(self):
        self.thread = threading.Thread(target=self.run)
    def start(self):
        self.thread.start()
    def run(self):
        pool = NSAutoreleasePool.alloc().init()
        engine = pyttsx.Engine()
        while True:
            text = "Say something, say something, anything."
            engine.say(text)
            engine.runAndWait()
        del pool
t = Test()

if shouldUseThreads:
    t.start()
    gtk.main()
else:
    t.run()  # this works