Members antiuser Posted October 4, 2011 Members Share Posted October 4, 2011 My board is a bit of an odd duck, it evolved naturally from experimentation during band practices, based on the guitar sounds I needed. Since we're a trio (guitar/drums/bass), I need to fill as much space as possible while staying as faithful as I can to the songs. So I came up with this design, with an A/B box to turn on a "noise/loop board", which has a digital delay set to loop and an iPhone going into the volume pedal. The output of the volume pedal and the A output from the A/B box then go into a Y box, through the tuner and finally to the amp. The idea is I can have a background sample from the iphone playing, or a little phrase or whatever looping on the delay pedal, then bypass the noise board to play other stuff while the output from it still goes to the amp, and I can control the level of that output or cut it off entirely through the volume pedal. The problem I'm having is, even with the noise board bypassed, the volume pedal still affects the guitar sound, as if it was never bypassed. I'm assuming it's because of the Y box, because the "bypassed" signal never gets to the delay pedal. Anyway, tl;dr version: the volume pedal on this is always affecting the signal even when it's supposed to be bypassed. How do I wire this board so that the volume pedal only works on what's coming out of the iphone/delay pedal? [ATTACH=CONFIG]339120[/ATTACH] Link to comment Share on other sites More sharing options...
Members stevemcb Posted October 4, 2011 Members Share Posted October 4, 2011 You probably need a mixer rather than the y box. Impedance mismatch issues are likely culprits. A cheap and pedalboard-friendly solution is the behringer MX400, which IIRC runs at about $25 brand new. I use one on my bass board to mix biamped fx chains. It's tiny, 4 in 1 out, and should deal with your problem I think. It's active, low-noise, small, metal box, only issue is that it needs a 12v supply - won't run off a 1spot. But it comes with its own supply, so it's not a big deal. Steve Link to comment Share on other sites More sharing options...
Members antiuser Posted October 4, 2011 Author Members Share Posted October 4, 2011 Will an impedance mismatch make the volume pedal affect the overall signal though? Link to comment Share on other sites More sharing options...
Members evets618 Posted October 4, 2011 Members Share Posted October 4, 2011 Can you run the A/B as A "and" B together? (Some work like this)... As in two inputs into one out? If so, why not guitar---> "A", and the loop board---> volume pedal---> "B", then "A+B" (out)---> amp? Link to comment Share on other sites More sharing options...
Members antiuser Posted October 4, 2011 Author Members Share Posted October 4, 2011 Mine will only do either A or B, not both together. Plus I only want B to be audible when it's looping, so I can play something with the volume pedal rolled all the way back and then fade it in. Link to comment Share on other sites More sharing options...
Members stevemcb Posted October 4, 2011 Members Share Posted October 4, 2011 Will an impedance mismatch make the volume pedal affect the overall signal though? I'm not an electronics guy, but back in the day I played a few times with 2 people plugged into the same amp via a Y connector. Adjusting your guitar's volume in that setting affects the other guys volume too. So I'm sure that this is pretty much the same deal. Steve Link to comment Share on other sites More sharing options...
Members antiuser Posted October 4, 2011 Author Members Share Posted October 4, 2011 Good call. I'll look into that mixer. Link to comment Share on other sites More sharing options...
Members ambient Posted October 4, 2011 Members Share Posted October 4, 2011 Try putting a pedal with a buffered bypass between the y box and the volume pedal. Link to comment Share on other sites More sharing options...
Members stevemcb Posted October 4, 2011 Members Share Posted October 4, 2011 Actually, this would also seem to be a perfect application for the Boss LS2... But I don't own one of them, and I do own the Behringer, so I can't say for sure. But IIRC the LS2 allows you to switch between 2 separate signal paths, and would therefore remove the need for your ABY and your Y. Check that out too. Steve Link to comment Share on other sites More sharing options...
Members vinnies Posted October 4, 2011 Members Share Posted October 4, 2011 Actually, this would also seem to be a perfect application for the Boss LS2... But I don't own one of them, and I do own the Behringer, so I can't say for sure. But IIRC the LS2 allows you to switch between 2 separate signal paths, and would therefore remove the need for your ABY and your Y. Check that out too.Steve this works - i have 2 different signal paths, going to 2 different amp setups, and i use the ls-2. Link to comment Share on other sites More sharing options...
Members antiuser Posted October 5, 2011 Author Members Share Posted October 5, 2011 I'm not going into 2 amps - the whole point of the setup is that it all goes into one amp. If I was using 2 amps I could just use the A/B box and go straight to amp #2 out of the volume pedal. Link to comment Share on other sites More sharing options...
Members ambient Posted October 5, 2011 Members Share Posted October 5, 2011 The ls2 won't work if you want to cut the input signal to the delay etc but idyll have the loop and iPhone stuff be mixed into the output. Link to comment Share on other sites More sharing options...
Members antiuser Posted October 5, 2011 Author Members Share Posted October 5, 2011 I have to be able to cut the input signal to the delay pedal and have the volume pedal control the output. Link to comment Share on other sites More sharing options...
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