I like to jam with headphones (Sony MDR-7506) while going through the THR10 at the same time (aux stereo from the FM3). I sit close to the THR10, which is usually set to low/moderate TV volume. I don't really hear the amp, but I kind of feel it. I read somewhere that playing totally silent (headphones only) can change the feel of the playing experience because the sound waves are no longer bouncing off/interacting with the guitar strings. I think there's definitely something to that (tried with and without), so I like to sit close to the amp with the speakers pointed right at the strings while enjoying a slightly more 'alive' sound through the headphones. I have the THR10 (older beige model) and the newer THR30II. I prefer the THR10 for monitoring the FM3 when jamming at normal TV volume. There is something more focused, present, sweet in the midrange about the THR10 to my ears compared to the THR30II, which I found a bit dark/wooly when using its aux input.