where to add a "mix" control on a rebote?

[pinkjimiphoton]

hi guys, built the original version of the rebote on the old tonepad board...

i love it, use it more than any of my other delays...sounds alot like my echoplexes (i DID put bigger caps on it to nuke the noise some, but other than that it's stock..)

i know i should be able to make a dry/wet mix control by swapping out some resistors or something,but i am too dang dumb to figure it out..

any suggestions as to the best way to do this? it's just a little too much delay wet signal sometimes...

thanks!!!

[deadastronaut]

just turn the level down...

there is a 33k above ic2, if you raise that the delay level will be quieter.....lower it = louder..


i changed my level pot to 100k, and changed the 33k to a 22k to get louder repeat levels....for proper bouncey stuff..

so i guess just do the reverse...

but seriously i can adjust the delay so when the level/mix pot is CCW there is no delay...


edit: IIRC  i put a 100k trim in the box on the output to match bypass level too...

[pinkjimiphoton]

hi rob, thanks mate...

but mine doesn't have a second ic, it's a real primitive one, the rebote rev1 from 2002.

an "anonymous forumite"....thanks dude... sent me a bunch of old boards he never got around to populating and this was one of 'em,

i love the sound but on mine you have a trimmer on the board for fine-tuning the delay time, a time control, and a slaps control, but no mix..that's the part i'm confused by.

this is the schem for the one i built:



to me, it seems like i'd have to replace like 4 of the 10k resisors with like a 50k dual stacked pot or something...

i dunno, i am very much a dullard with this one...i'm a hack, not an ee, so my understanding is fairly limited.

don't need to understand all the parts and functions to whoop something together. 

anyways, i don't wanna change the tone of this thing, but at this point the only control i have over it is the time and repeats..be nice to get more repeats and be able to turn 'em down slightly so it's not so freakin' muddy'd up...right now, i often use less repeats and a shorter delay so it's not too intrusive...i just use it for extra ambience on solos like i use my echoplexes for. i have a ddl on my board for more "fancy, new fangled, high-falutin' delay trick stuff"..

[deadastronaut]

oh i see...i might be way off on this but it seems logical to my warped mind in a hack type way...

a crude n quick solution which may work...

delay out>>>pot 3

pot 2>>>>>>>>>>>>>out

dry signal >>>pot 1


take a dry signal from the right of the 4.7uf..after fet..........blend!.....i'm sure there is a much better/proper EE way though...but i'd try it just too see..

[pinkjimiphoton]

what the 'eck, in for a dollar.... 



i'll try that today, thanks rob! only thing i'm wondering is if it's gonna bleed off too much signal to ground...
this thing is already almost a smidge too quiet.

gonna grab my pedalboard outta the trunk when the girl's at work, and give it a shot.

thanks bro!
cheers!

[deadastronaut]

yeah you may be right.....hmmmmmm.... i dunno....just a hack guessing.

[pinkjimiphoton]

if it's gonna change the tone, screw it, i'll live with it...

echoplexes didn't have tap tempo, and i still love them 40 years later.

it's the SOUND. the later rebote versions don't sound like this one does...this is almost liquidy like a good tape echo..

and every bit as noisy.

i have to be quick on the draw with a volume pedal at the end of songs or my band whines about "the ocean"...lol

wondering tho, if it will have phasing issues doing this..

but i'm sooooooooooooooo gonna go for it... right now. report back later.

[deadastronaut]

ha ha...

disclaimer..

on your own head be it...

[pinkjimiphoton]

thank god there's nothing in there....   

[slacker]

It's a tricky one, the problem is both the wet and dry signals go through the pin 15 16 opamp in the PT2399, this means that changing one thing will affect something else. This is probably what gives it some of its magic as well, the dry signal gets some filtering and possibly some other goodness from the PT2399, if you look at the later rebotes and other delays you'll see that the dry signal goes no where near the PT2399.
If you made the 18k resistor off the wiper of the "feedback" pot bigger that would reduce the maximum volume of the delays, as the pot controls both feedback and level reducing one reduces the other, so you'd also get less repeats.
Reducing the 15k between Q1 and pin 16 will increase the volume of the dry signal, unfortunately this also increases the level going into the delay so will make the delayed sound louder, might also affect the tone. You might be able to find some happy medium by making this smaller to increase the dry sound and then reducing the delayed volume by messing with the 18k.

I can't think of any way to add a proper wet/dry control without basically turning it into a later rebote.

[pinkjimiphoton]

shoot. looks to me like i guess i'm stuck then...thanks slacker.

i built a guitarpcb d'lay, which is basically the later rebote (not with the delay spillover) but it sounds nothing like the earlier version...

guess i'll just live with it's limitations, as i do love the sound of it.

onwards and upwards!