Issue with pyttsx3

Question

I am trying to set up a condition so that I can switch between voices for my AI however I am running into the error

TypeError: 'int' object is not subscriptable

This is my code for this section:

def speak(audio):
    engine.say(audio)
    engine.runAndWait()

def getvoices(voice):
    voices = engine.getProperty('voices')
    if voice == 1:
        engine.setProperty('voice', voice[0].id)
        speak ("Jarvis at your service")
    if voice == 2:
        engine.setProperty('voice', voice[1].id)
        speak ("Friday at your service")

Is anyone able to help? Being coded on python 3.9