I have the ST-J75 tuner, and it has a tendency to momentarily mute the signal when it contains heavy bass. This behavior seems to subside quite a bit after the unit is warmed up (15 minutes or so), but still occasionally does it. I plan on giving this tuner, and a matching Sony integrated amp, to a friend who loves music but cannot afford a decent stereo system. She lives about 45 minutes from a major metro, and currently uses an old boom box. She also likes listening to public radio stations. I'm including a pair of Boston A60 speakers and a pretty good Rotel CD player...I think she will really appreciate a nicer system. Anyway, I am recapping both the tuner and the little amp before I give them to her...mostly to reduce the chances of future problems. I have no plans to adjust the tuner (don't have the tools or the skills!). However, I would like to try to back off the sensitivity of the muting via IFT101. While I can certainly experiment, I would prefer to minimize the amount of of adjustment I do. So, was wondering if anyone can confirm which way to turn IFT101 to reduce sensitivity to low-frequency signals? Thank you!