I'm working on a guitar effects switcher, where I can add all of my pedals in individual loops and turn on any combination at the press of a button. I was almost done, with a working prototype, when I came across a video about running pedals in parallel with a dry signal which caught my attention.
Having looked across the web for some schematics, I came across this one, which looks simple enough: https://www.runoffgroove.com/splitter-blend.html
Now, before I go off building it, I have to wonder if I actually need the buffering (though the phase switch is definitely something useful in this scenario). The two switcher loops I'd want to be able to run in either series or parallel would be the last ones (for delay and reverb), sitting in the amp's own effects loop and looking the schematic, there's already some buffering there, hence the question: does it really need extra buffering? That would make sense if I was running a totally unbuffered dry signal through it, but here I think I'm just overengineering.
An additional, more theoretical question is: why does the schematic above use such big values in what I see as high pass filters (combinations of 220uF/1M or 10uF/1M). If I got my calculations right a 22nF would suffice for Fc < 20hz
Amp effects loop schematics:
Having looked across the web for some schematics, I came across this one, which looks simple enough: https://www.runoffgroove.com/splitter-blend.html
Now, before I go off building it, I have to wonder if I actually need the buffering (though the phase switch is definitely something useful in this scenario). The two switcher loops I'd want to be able to run in either series or parallel would be the last ones (for delay and reverb), sitting in the amp's own effects loop and looking the schematic, there's already some buffering there, hence the question: does it really need extra buffering? That would make sense if I was running a totally unbuffered dry signal through it, but here I think I'm just overengineering.
An additional, more theoretical question is: why does the schematic above use such big values in what I see as high pass filters (combinations of 220uF/1M or 10uF/1M). If I got my calculations right a 22nF would suffice for Fc < 20hz
Amp effects loop schematics: