Most of the music was recorded into a Macintosh computer using a board and manipulated with music editor programs on the computer. Unique effects such as analyzing and inverting the frequency were applied to the tracks to create original sounds. The band would "get an arrangement together" and convert it into analog tape. Reznor sampled excerpts from guitar tracks and processed them to the point of randomness and expression. Digidesign's TurboSynth and Zoom 9030 effects unit were used extensively to process guitar tracks, often in conjunction with a Marshall JMP-1 preamp; Zoom 9030 was also used to distort vocals. Acoustic drums in various settings, as well as Roland's TR-808 and R-70 drum machines were sampled through multiple Akai S1000s and a Kurzweil K2000. Additionally, Vrenna had compiled various movie samples on Digital Audio Tapes for Reznor to sample. Other equipments and software Reznor used for recording the album include Oberheim OB-Mx, Minimoog, Prophet VS keyboard, Eventide H3000 Harmonizer, Pro Tools and various Jackson and Gibson guitars.