The low sound shouldn't really be an issue for the ON, no point in going through all the hassle of getting it replaced, to maybe still end up with the same problem and also having to restart your progress. The ON is quite a forgiving and low maintenance Tama, and rarely makes any beeps except when: it's attention icon lights up from an empty meter (which takes hours for one to fully empty except in the needy baby stage), it poops, gets sick during the baby stage or from neglect, and when it dreams. To my knowledge, it doesn't randomly get sick (I raised the same Tama for 23 days, and it only got the usual sickness during the baby stage in the whole 23 days, unlike black and white models), it doesn't call for discipline (so that's another reason for not needing to be on the constant lookout for it's beeping), it has a very long happiness bar which takes a VERY long time to completely empty once you fill it up initially, and 6 hunger balls instead of the common 4 hunger hearts, so as long as you give it a look like once every 3 hours it should be fine don't worry
I take mine to work with me, and on a busy day only get to check on it maximum 3 times in a whole work day, and never even once did a bar completely empty since I've been running it
It really does feel more like a companion, rather than a needy pet you're constantly taking care of (like some of the black and white models I run).
Yeah same here, no chance of hearing mine if it's in my bag also, but no need to go to the extreme of keeping it in your hand either, as I stated in the paragraph above, it's quite a low maintenance Tama and it'll be fine for a couple of hours on it's own
Ahh yeah, DEFINITELY agreed about still enjoying the experience! I *ABSOLUTELY LOVE* the ON and that it's the first colour Tama in English! The addition of colour and a higher resolution screen adds so much more definition and vibrancy to the characters and the Tama World in my opinion.
Hope this eased your mind a bit and you enjoy your new Tama
(sorry for the length and the rant btw)