A DigiTech GSP 21 Pro professional rack-mounted guitar signal processor and multi-effects unit. The device is housed in a black-finished metal 1U rack casing with integrated mounting ears for standard rack installation. The front control panel features a dual-display interface consisting of a central liquid crystal display (LCD) for parameter editing and a three-digit red LED display dedicated to program numbers. User interface controls include a power rocker switch, tactile push-buttons for Program (Up/Down), Parameter (Up/Down/Left/Right), Title, Utility, Bypass, Compare, and Store. Two rotary control knobs are located on the right for Output Level and Input Level adjustment. A single 1/4-inch input jack is positioned on the front panel for ease of access. The unit is marked GSP 21 PRO on the left side of the faceplate and bears the manufacturer logo for DigiTech on the right. The top edge is inscribed with the text GUITAR SIGNAL PROCESSOR.
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