Haah is a different kind of pan knob. How is it different? Instead of adjusting the volume on each channel to steer the sound in one direction, it uses delays. It takes advantage of a very cool psychoacoustic effect called Precedence Effect. It goes a little something like this:
When you are in the real world listening to real sounds, how do you think your brain is able to tell which direction a sound is coming from? If you said “Sound coming from the left of your head is going to be louder in your left ear,” then you are only about 10% correct. While the sound in your left ear may be slightly louder (especially at higher frequencies) if the sound is coming from your left, the biggest indicator of direction is actually the time the the sound arrives at your ears. Your brain knows the sound is coming from the left be cause the sound actually hits your left ear first.
The timing difference is very short (just a millisecond or so, depending on how fat your head is), but it’s enough to tell your brain with pretty good accuracy where the sound is coming from. Haah uses this same effect to pan your track.
Haah also adds a couple super handy features to make your life a little easier. The Mono button lets quickly check that you aren’t completely screwing up your mono sound. The 10x switch lets you apply more extreme delays than you would hear in the natural world.