Thanks Bart. The frame line "blink" is useful outdoors where I really can't hear the faint beep. Unfortunately, yesterday when I was using the Leica 24mm there is no frame line in the viewfinder. I will contact David at Pixii and see if they can increase volume of the shutter beep or perhaps flash one of the viewfinder LEDs (there are three near the bottom of the frame) that are used for indicating exposure (under arrow pointing left, over arrow pointing right, and center dot for correct exposure.