Those just look like true bypass loopers. They go in series.
Parallel loopers depending on what you're doing.
You could have the looper split the signal out to two pedals, and combine those two pedal's outputs. That can be done with just a couple of jacks. But then you could have phase and impedance issues.
If you just ran your signal in parallel with a pedal, it'd make a feedback loop. So that's no good. SO! My suggestion:
Do an active splitter (just two buffers sharing an input) to two outputs ("send" on most loop pedals). These outputs will go to the effects you want in parallel. Then, you'll take the output from those effects and run them into their own buffers and connect the output of those buffers.
Now phase! To correct phase, you can just add an SHO or LPB style booster to either chain. If you match the two collector and emitter resistors (or drain and source for an SHO), they won't boost. They'll just reverse the phase of the signal. Add a switch to bypass it.
... this is hard to explain. So, here's a text diagram:
- Code: Select all
|> Buffer > Send > effect > return > ............. > buffer >|
In|.............................................................| > Out
|> Buffer > Send > effect > return > phase reverse > buffer >|
It's basically just two loopers wired side by side with buffers before the send and after the return. And a phase reverse on one of them.
Here's some buffers:
http://www.muzique.com/lab/buffers.htmI'd go with Jfet on the input, and BJT on the output, but it really doesn't matter. If you're making a PCB, go with OPamps for sure. I've found OPamps can sometimes be awkward on perf/stripboard, though.