DD-3

Boss DD-3 Digital Delay pedal (Japanese Manufacture).

Subsequent Boss Digital Delay models include:

• DD-5
• DD-6
• DD-7
• DD-8

Controls

• Knob 1 - E. Level
• Knob 2 - F. Back
• Knob 3 - D. Time
• Knob 4 - Multi-Switch to select:
  • 50 ms
  • 200 ms
  • 800 ms
  • "Hold"
• Footswitch 1 - Toggle effect On/Off
• Output 2 - Enable ping-ping delay

Pedal Manual

• Boss DD-3 Owner's Manual

Phase Inversion: No

Candidly, this schematic is a bit more than we're able to work through and determine whether this pedal inverts phase or not. Right now, we're taking it as an article of faith that it doesn't invert phase based on our own past experiences, but memories are known for being inaccurate.

Without going through the schematic and understanding how phase is changed inside the pedal, the only current method is to put the pedal on an oscilloscope and see the outcome.

Schematic

From:

• https://www.hobby-hour.com/electronics/s/dd2-delay.php

Assumed Public Domain, unaware of any Copyright claims

Artists

• Nuno Bettencourt
• Miki Berenyi
• Joe Bonamassa
• Billy Duffy
• Paul Gilbert
• Dave Grohl
• Yngwie Malmsteen
• Tom Morello
• Dave Navarro
• Les Paul
• Michael Schenker
• Slash

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Additional Sources

1. http://stinkfoot.se/archives/516
2. http://equipboard.com/items/boss-dd-3-digital-delay