Close the MyCat window and edit MyCat.q some more.  We want to make the MyCat window smaller.  So, in function MyCat, change rectangle [100 100 400 400] to [100 100 200 200] .  We want the MyCat button to take up the entire client area of the MyCat window.  So, in function _MyCatSize, eliminate the use of l, t, w, and h, and replace [l t w h] by either [0 0 width height] or (GetClientRect window) .  Then Load your MyCat.q file into your session, evaluate (MyCat) and mouse click the button in the MyCat window to hear your cat.