Implementing a Time Bar

[Vaaal]

Hello, I am trying to implement a Time Bar, which is a bar that indicates 
the elapsed time from the beginning of the stimulus.

The way I did it is to loop through a slide (which has a duration of 20ms). 
The slide has a simple rectangle image. At every loop, the size of the 
rectangle is changed, so that it appears as shrinking. After the slide 
there is an inline with a condition: if the width of the image is 0, then 
it go outside the loop (and calculate the RT etc), otherwise the slide is 
repeated (Go To  a Label just before the slide).

This works perfectly when you look at it. However, when I try to do a real 
experiment, it has some problem. Notice that the software will go out of 
the slide loop also when the subject will press any button. Therefore, in 
the input mask of the slide I set a keyboard device, end action: jumpto the 
label after the slide. PreRelease is set to 0.

The problem is that during the experimental session the keystroke will not 
be detected every time. I suppose that sometime the software is evaluating 
the inline script (repeat or not the slide, change the width of the image) 
and therefore the keystroke is not detected by the slide.

Is that an easy way to solve this problem? (maybe playing around with Time 
Limit, Timing Mode and this option of the Input Mask of the slide?)

Or, alternatively, is there any way to create a time bar as illustrated 
here?

Thank you very much for any help.

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