I never tried running the SLO into a RNDI instead of using the onboard DI. But I did today. There is a difference though it is somewhat subtle. The SLO into the RNDI sounds better.
Hard to describe but more "studio like". Less raw.
Interestingly there is more overall output available available when using the onboard DI. Not that it really matters but it's a fact.
The RNDI seems to attenuate highs a little making them more sweet. I quite like it. Probably not a world of difference for live sound but noticeable in a studio.
Takes up more pedalboard space this way thoigh. Oh, adding the Effectrode LA-1A in front of all of this is whole new dimension.
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Thaaaat's what I'm talking about!