I've got aion's Lab Series Preamp built but I'm having some difficulty with the compressor trim adjustment.
I did a quick sound/sanity check before I made any trim adjustments and the limiter LED seemed to pulse with my picking, but the distortion levels were way off. I downloaded the signal generator for my phone and followed the instructions for setting the distortion trimmer and the compressor/limiter trimmer and both went perfectly - I was able to adjust to both desired AC voltages. However, with both trimmers set properly, the limiter LED does not light, nor do I hear any compression. In fact, with the distortion trimmer set properly, there is no compressor/limiter trimmer setting that gives me any compression. I've done it several times with the same result. I know that the build doc says to leave it at the lowest setting, but as I said there is no trim setting that works.
Any ideas as to how to troubleshoot this?
And I should mention that everything else seems to work perfectly (and sounds awesome!!), it's just the compressor/limiter.