[sdiy] Adding signal LED's to an LFO module

[vitreousflux]

I have an EFM SBM board that has 2 LFO's - I would like to add two LED's to
each LFO, that will fade in and out of brightness, in sync with the LFO
phase. (one LED for positive phase, one for negative phase)

I'm thinking that adding a simple opamp or two to do this would do the
trick, but I'm a bit of a newby when it comes to original circuit design.

Can anyone assist?

Rob