# MXR Digital Delay System

> This delay & echo entry consolidates documented MXR Digital Delay System variants, controls, settings and roles across dated guitarist pedalboards.

- Canonical page: https://pedalboardarchive.com/pedals/mxr-digital-delay-system/
- Machine-readable index of the archive: https://pedalboardarchive.com/llms.txt
- Evidence and reconstruction conventions: https://pedalboardarchive.com/methodology/

- **Category:** Delay & Echo
- **Types:** Digital delay, Rack delay
- **Also known as:** MXR DBL, MXR Digital Delay
- **Controls:** Delay time, Feedback, Mix, Modulation
- **Identification:** The model is identified.
- **Documented appearances:** 1 board, 1978

A wide black rack delay with a dense row of silver controls and delay-time readout, installed as a relay-switched Blue Box module.

## Documented boards

Each row is an observed appearance on a dated board. A position is only an observed one where that board's order evidence says so.

| Artist | Board | Date | Positions | Order evidence | Page |
| --- | --- | --- | --- | --- | --- |
| Frank Zappa | Blue Box four-output effects system | 1978-01-01 | 2 | Source-described | https://pedalboardarchive.com/artists/frank-zappa/blue-box-four-output-rig-1978/ |