Works great! Sounds awesome!

Requires a 9v ac adaptor. Boss PSA recommended.

Super fast shipping

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The Boss RDD-20 Micro Rack Series Digital Delay is a vintage, 12-bit half-rack digital delay unit released by Boss in 1987. It is highly regarded by musicians and studio producers for its unique combination of early digital grit, warm modulation, and tactile desktop form factor.

Key Features and Specifications

• Early 12-Bit Digital Architecture: Uses 12-bit digital processing which provides a distinctively warm, slightly "lo-fi" character. It shares a similar tonal heritage with the legendary early "long-chip" Boss DD-2 and DD-3 pedals.
• Delay Time: Provides up to 400ms of maximum delay time. It relies on a 9-position coarse selector dial paired with a fine-tuning knob to dial in precise times.
• Built-In Modulation: Includes dedicated controls for modulation Rate and Depth. Turning up the modulation allows you to easily transform standard echo into warbly tape-like delay, lush widening effects, deep chorus, or flanging.
• Flexible Outputs: Features mono input with variable output routing. When using the "Effect" (Wet) jack alongside the "Mix" jack, the unit automatically separates the dry and wet paths. This makes it incredibly easy to configure a true wet/dry studio or amplifier rig.
• Half-Rack Form Factor: Part of the classic 1980s Micro Rack Series (9.5-inch width). It sits comfortably on a desktop next to synthesizers or drum machines. You can also mount it side-by-side with other Micro Rack processors using a dedicated tray.
• Power Requirements: Runs on standard 9V DC (Center Negative) and requires a regulated power supply like the Boss PSA series. Early digital units are notoriously sensitive to power fluctuation, so using a properly filtered and isolated supply is crucial to avoid operational hum.

Control Layout

• Input Level: Controls incoming signal gain, backed by a Rear Pad switch (-20dB / +4dB) to comfortably handle everything from hot line-level synths to guitar pickups.
• Delay Time Coarse Selector: 9-stage rotary dial.
• Delay Time Fine Modifier: Smooth potentiometer to fine-tune the exact spacing.
• Feedback: Adjusts the number of repeat echoes.
• Modulation (Rate / Depth): Sets the speed and intensity of the wobbly, lush LFO pitch shifts.
• Effect Level / Tone: Blends the volume of the repeats and shapes their EQ (from bright, crisp digital pings to dark, moody analog-style textures)