|Mono||Single channel sound.|
|Stereo||Unspecified two-channel system; most commonly used for television and video, as film stereo systems are usually specified.|
|Dolby||Multi Channel surround sound. Nearly all modern movie soundtracks use Dolby or a similar process.|
|Dolby SR||Dolby Spectral Recording. Uses more advanced noise reduction and provides wider dynamic range than Dolby.|
|Dolby Digital||The best quality Dolby can provide.|
|DTS||Digital Theater Systems. Information stored on a CD-Rom and synced to the print.|
|DTS-Stereo||A Dolby Stereo compatible, analog version of DTS.|
|DTS 70mm||DTS version for 70mm prints.|
|SDDS||Sony Dynamic Digital Sound. Another digital sound system that stores discrete information for all available channels.|
|Ultra Stereo||A popular stereo format.|
|Cinerama 7-Track||Dynamically mixed multi-channel system, stored on a separate magnetic reel and used with three-strip Cinerama releases.|
|70mm 6-Track||A discrete 6 channel sound mix, used only on the 70mm release of a film.|
|4-Track Stereo||Early form of stereo sound.|
|Sensurround||Another experimental system that delivered thunderous low-frequency rumbles. Only used in four releases.|
|Fantasound||Experimental Multi Channel, used only on Disney's Fantasia.|
|CDS||Cinema Digital Sound. One of the earliest digital delivery systems. Now defunct.
You can now track the status of your Sound Mix submission and if it has not been approved, we'll tell you the reason why.
If you are using the mobile apps, mobile website or desktop website you can access this feature via the 'Track your contribution' button, which has been added to the submission email receipt. Additionally, if you are using the desktop website, you can also use the 'Track Contribution' button now found in your contribution history page.
Clicking this button will take you to IMDb Contributor, our new contribution specific site where you will be shown the status of your request.