DD-20

Boss DD-20 GigaDelay

The Boss DD-20 has been obsolesced by

• DD-500

Controls

• Knob 1 - "E. Level":
• Knob 2 - "F. Back":
• Knob 3 - "Tone": Turned fully counter-clockwise this knob emphasizes bass; turned fully clockwise emphasizes treble frequencies in the delayed signal.
• Knob 4 - "Mode": Delay types:
  • Sound on Sound (SOS) - "sampler" Record loops and then record on top of the loop you've already recorded.
  • Twist
  • Warp
  • Tape
  • Analog
  • Standard
  • Dual
  • Pan
  • Smooth
  • Modulate
  • Reverse : A reverse-gated delay sound, makes your instrument sound like it's being played on a tape or record being spun backwards.
• Knob 5 - "Delay Time":
  • simple knob-turn: speed up or slow down delay on order of milliseconds.
  • push-down and knob turn: speed up or slow down delay on order of hundreds of milliseconds.

• Button 1 - "Tap":
• Button 2 - "Tempo":
  • Buttons 1 & 2 together: "Light":
• Button (red) 3 - "Write":
• Button 4 - "Select":

• Footswitch 1 (left) - "On/Off": This turns the pedal On and Off
• Footswitch 2 (right) - "Select": This selects from each of the 4 banks

Input and Output Jacks

• Input A
• Input B
• Control Pedal input
• Headphones Out
• Output A
• Output B
• AC Adapter input

Output Modes

1. -10 dB Basic instrument level output
2. -10 dB Basic instrument, A = Dry, B=Wet
3. 4 dB output - press left pedal down while plugging in AC adapter
4. 4 dB output A=Dry, B=Wet

General Information

• https://www.boss.info/us/products/dd-20/
• http://www.bossarea.com/boss-dd-20-digital-giga-delay/

It's interesting to note that for 40 years Boss has successful pedals with broad "metal cap/flap"-style footswitches. Dunlop/MXR, Digitech/DOD and the legions of boutique and home builders have put Boss on the defensive and now Boss has returned to their CE-1 era button-style footswitches.

Modifications

http://music-electronics-forum.com/t16606/

Looping Features

Sound-on-Sound mode.

Pedal Manual

https://static.roland.com/assets/media/pdf/DD-20_OM.pdf

Phase Inversion

No schematic means that we're unable to determine, without an oscilloscope, if the DD-20 inverts the signal phase. That said, the schematic is probably so complicated that it would be almost impossible for the lay person to be able to trace and determine whether this pedal inverts. Once we get it up on a bench with an oscilloscope, we'll report here if the phase is inverted.

Schematic

None available.

Artists

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Additional Sources