if args.trigger == 'gpio':
        import triggers.gpio
        triggerer = triggers.gpio.GpioTrigger(channel=23)
        msg = 'Press the button on GPIO 23'
    elif args.trigger == 'clap':
        import triggers.clap
        triggerer = triggers.clap.ClapTrigger(recorder)
        msg = 'Clap your hands'
    else:
        logger.error("Unknown trigger '%s'", args.trigger)
        return