Modding Blue Box

[undothis]

Hi I want to make an MXR blue box arpegiate and make weirder noises. I heard this pedal lends itself to that. Has anyone tried to mod it? Thanks

[AzzR]

Check the build reports on the MXR Blue Box at www.tonepad.com.

I know of one mod where you put a switch somewhere on the flip flop and you can switch it from two octaves to one octave down.

Dream

[hank reynolds 3rd]

check the search field ,especially Mark Hammer's note's ....

http://www.diystompboxes.com/smfforum/index.php?topic=39390.0

here's one to get you started   

Sam

[Processaurus]

To get the random arpegios, do the regular feedback loop thing:  Put a 1 meg pot set up as a variable resistor from the input of the effect and the output of the effect (but before any of the bypass switching).  I did that yesterday and it sound f'd.

[Mark Hammer]

The Blue Box does not "arpeggiate".  What it does do is lose track such that notes jump.  My hunch is that the fastest route to forcing that is to vary R23 in the Tonepad schematic.  That sets the gain of the second op-amp so that the level is high enough for the 4013 flip-flop to respond to rising waves and divide them.  The first op-amp stage drives the envelope follower that gates and ungates the output,  If you vary the value of R23 (and I suspect a foot-controlled or LDR-controlled resistance of 100k in series with that resistor would do the job very nicely), you would lower the gain and could push the flip flop into losing track while you hold notes.  You would not have to actually change your picking strength or lose the gating function that cleans up the sputter at the end of notes.  So, you could hit a note, hold it with finger vibrato, force the flip-flop to lose tracking with your foot, then get back on track.  Sort of like a Whammy pedal, but much much sicker.

Don't expect it to behave well, though.

[flibbergibbin]

First off sorry for being off topic but could someone tell me what is the difference between the reissue and the build off of tonepad? Also if your up for it what's the difference between the aforementioned and the original. Thanks, I'm thinking of getting one just didn't know which way to go. Again sorry for being off topic.