What I've done in the past is create several image controls on the form and lay them on top of each other. Then you programmatically set all images .visible = false except the one you want to show.  

Using VBA to change Picture
I'm studying property of sound wave and I was wondering what is difference between two waves (one is original and one is 180 flip phase of original) ?

Amplitude and frequency remains same and also wavelength is same, so are they same?? I could not detect any difference from hearing two sounds. If different what is different and can human/computer detect it? What is basically difference between two waves?
