Waves Nx Head Tracker by AndyDandy
I've been using the Waves Audio Nx "virtual room" plugin for mixing because I currently don't have a treated space nor a set of monitors. I got the Waves Audio Nx plugin and initially did head tracking with the built-in webcam tracking, which worked well out of the box but had definite latency problems. It seemed like my head could turn faster than the plugin could adjust the audio. Thinking that it might be more useful if I tried the dedicated Nx Head Tracker with the plugin, I thought I'd drop the $49 price because it was on sale.
It effectively deals with the latency problem doing head tracking with a webcam with the Waves Nx plugin. The tracking of the virtual monitor speakers seems more natural, and when you stare at a blank space in the room it seems like there really is an invisible speaker coming out of the air.
It was easy to setup as pairing a bluetooth device and the included strap will fit on any set of headphones. It comes with an extra fastener should the first one become broken.
The only problem I found with the product is that if you jerk your head very quickly there is an audible crackle as the plugin adjusts to your head's new orientation. However, if you put the plugin in "Sensor Fusion Mode" (using both the webcam and the head tracker to track you in the virtual space), it eliminates this distortion.
I was afraid the head tracker would just be a gimmick, but it honestly adds a lot to the plugin. There's also a free app for android and iphone to utilize the tracker with your phone, but it's geared more towards general listening than mixing. It would be good if there was some mixing oriented apps that uses this available for the iphone or android.
The tracker does not come with the separate software for Mac and Widows to allow you to use it for general listening. That is a costed option at an additional $9.95. For the price of the plugin, it might have been better to include that with the professional plugin so that people using the Virtual Mix plugin could directly target what it would sound like for people who use the tracker solely to enhance their listening experience. That seems like an oversight. Otherwise, a dead simple device that does what one would expect.