So, it would make sense that time is vertical and x and y are the left and right stereo channel. This wouldn't sound like much, since you only have about 10 periods of a sound with increasing volume. Probably would just sound like a little blip, that's all.
You still need to define your time units. What's the desired duration or pitch? Then simply create two phase shifted, linearly increasing sine functions, scale them to a U8 or I16, and combine them into a 2D array.
Now use the sound VIs to play it.