Just redid this Pedaltrain Nano board by adding the MXR Isobrick Mini instead of a TU3 with a daisy chain and the Wampler Ego Mini instead of the TC Spectracomp. Very nice with clean power and a nice step up in compressor pedals from the Spectracomp which is nice but somewhat limited in comparison.
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I have that M81 preamp coming in. Will be the third time I've owned it. I don't know why I got rid of it two other times. IMO it's the best sounding clean preamp out there.