I know you’re asking vasidudu, but I’m currently not using any external fx. Just what the Op-1 has. I’ve sold most but currently have boxed up a BigSky and Ottobit Jr.
Might end up selling those too.
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Yes 
Kept a Doctor A for its Delay, Specular v3 for the Reverb algo as well as an Elektron Analog drive which I might use on the DB-01 and FMR RNC which excels at “glueing” my main outs nicely.
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