ROM Banks
ROM Banks contain the factory settings for a relevant device. You can select to view the ROM banks for all devices that are compatible with Enigma. This allows you to use the factory presets of a device you do not own to edit your device. For example, you may own a MK-449C, and want to assign the sliders to the volume controls of the Cubase mixer. The easiest way to do this is to copy the faders from the UC33e defaults ROM bank (Preset 1 - Cubase Channel mixer) and paste them to the faders on your MK-449C bank.
If you do not select to view all device's ROM files, you will only see the ROM files for any Device you have connected.