rack unit

In guitar effects coverage, the term is used to describe classic units like the TC Electronic 2290 Dynamic Digital Delay from 1985¹, the Roland SDE-3000 from 1983², the Korg SDD-3000 from 1982³, the Ibanez DM2000⁴, the DeltaLab DL-4 from the mid eighties⁵, and MXR's 1970s Flanger/Doubler⁶. Many modern pedals are described as emulations, recreations, or reissues of these rack units in pedal form, keeping the original sounds while changing the format⁷⁶². The sources also use the term for studio processors, such as the Yamaha FX500 multi effects processor, described as a late 80s rack unit⁸, and for hardware with features like dedicated filter controls and connections for remote foot pedals⁹.