Boss DD-6 Treble Roll-off mod

[neilbunker]

I know some people have been requesting this, but I couldn't seem to find the info available anywhere. So I used an audio probe and found some test points that can be tapped into for the standard capacitor/switch delay mod without having to mess with any surface mount components. I suppose I should mention that I did not reverse-engineer any existing mods, it was simple enough to use an audio probe to find a place before the mixing stage to tap in. Unfortunately, I am under the impression that the feedback loop is in a chip somewhere, so this mod will cut high end on all repeats equally, it won't cut more high end off successive repeats.

Here's a demo:

Here is the board. There are three points we are looking for: if you are looking at the underside of the main circuit board, they are on the right, about a third of the way down:





Close up, here are the points. The A-side connection is just below the "R" on the R36 label, the B-side connection is just above the "R" on the R37 label, and the ground can connect to any solder pad on the board's ground plane. I chose the point just below the "2" in the R26 label for my ground, in order to keep my wires near each other:





The interior is super cramped, so you'll have to find a sub-miniature, center-off DPDT switch. Standard 'miniature' DPDTs won't fit. I found mine for a pretty fair price here: http://www.parts-express.com/pe/showdetl.cfm?Partnumber=060-508. You could probably fit a standard SPDT in there more easily if you only want to mod one of the two outputs. If you don't want to keep the stock sound available, you could use an on-on switch instead of a center-off switch.


The holes are much smaller than a standard solder pad, so most wire will not fit through. I used left-over legs from an 1/8 watt resistor to feed through these holes and attach the wires running to the switch. Legs from capacitors or 1/4 watt resistors did not fit easily for me. Using small pliers, I pushed the wire into the center of the test point and touched my soldering iron to the wire near the tip. You may have to fiddle the wire around until it feeds through the hole, so I would recommend not touching the iron directly to the board to avoid damaging it. 

That should be enough for many of you guys, but if you want more detailed instructions and advice on drilling the enclosure, capacitor selection, ect., I posted a pretty detailed set of instructions with lots of pics on my blog: http://tonehack.blogspot.com/2012/02/boss-dd-6-high-cut-mod.html

So there ya go! Cheers, and happy modding!

[gregwbush]

Sounds good to me dude