Hi Trapland... just joined the forum. Saw a post of yours from 2013 re taming negative feedback on a DSL15. I have one & did ECC823 & Greenback. No internal mods yet. Would love to get Green crunchier. Was gonna toy with V1a Rk & Ck til I saw your post. Genius! But, looking at the schematic, I can't figure out that mess hanging off (what I presume is) the feedback loop. Did you ever figure this out??