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===Extra Material===
[[Multitracks ]] for two extra songs, "[[37 Ghosts]]" and "[[38 Ghosts]]", were found on the data disc that came as part of the deluxe and limited edition releases. "38 Ghosts" is very similar to "[[Demon Seed]]".
===''Ghosts I-IV'' Discussion===
*4XLP vinyl edition, which was made available in Australia and Japan on April 5, 2008, and in the US, UK, and most of Europe on April 8, 2008 (this was not made available through ghosts.nin.com)
*Deluxe Edition (priced at $75), which includes 2 CDs, a DVD-ROM of [[Multitracks|multitrack]] files, Blu-ray Disc of the album featuring 96khz/24bit high resolution stereo audio with an accompanying slideshow, and hardcover 48-page book in a black fabric slipcase. The DVD-ROM also includes the album in 320 kbps MP3 files, 22 wallpapers, web graphics, and an abridged PDF version of the book.
*Ultra-Deluxe Limited Edition (priced at $300), which includes everything in the Deluxe Edition, as well as the album on a 4-part 180 gram vinyl edition and two Giclée prints (one being the image used on the album cover, the other being one of eight other Phillip Graybill images.) This version is limited to 2500 copies, each of which is numbered and signed by Reznor himself. Although it was initially expected that this edition would take a while to sell out, it was announced on March 4, 2008 that all 2500 copies had been sold.
==Multitracks==
The multitracks for all the songs on ''Ghosts I–IV'' are included on a DVD-ROM as a part of the deluxe and ultra-deluxe editions of the album which can be ordered from ghosts.nin.com, although the latter has sold out. Additionally, multitracks for the songs "10 Ghosts II", "19 Ghosts III", "26 Ghosts III", "34 Ghosts IV" , and "35 Ghosts IV" were available from [[remix.nin.com]].
==PhotographyArtwork==''Main articleSee also: [[The Photography of Ghosts I–IV]]''
Intended as a visual aesthetic to accompany ''Ghosts I–IV'', a 40 page PDF is included with all of the official digital releases from nin.com. Each page is dedicated to a track and serves as the album's credits. The PDF contains photography by Phillip Graybill and Rob Sheridan highlighting the recording process as well as the outside world. The Deluxe and Ultra-Deluxe Limited Edition of ''Ghosts I–IV'' feature a hardcover booklet in a fabric slipcase.
When purchasing the album in MP3 or Apple Lossless formats through nin.com, each track is embedded with unique track art that differs from the photograph in the PDF. While some of the images appear to be cropped from the larger PDF, most of the images are noticeably different. A slideshow on the Blu-ray from the Deluxe and Ultra-Deluxe editions contains un-cropped versions of the images embedded in the digital version of the album.
 
The typeface used on ''Ghosts I-IV'' is Eureka Sans Caps Light.
In a post on his Patreon[https://www.patreon.com/posts/55868857], Rob Sheridan posted the following background info:
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