Wanted to post this topic as i recently got a new reface dx. Very excited and mostly happy with this purchase..but I got it to play on the couch/in bed so the internal speakers are what I use.. and IMMEDIATELY I noticed that the speakers make a weird buzzing noise when playing certain patches.. usually chords of mid/low registers. Interestingly enough the right speaker seems to be worse than the left with this. After a quick google search this seems to be a very common issue! Yamaha certainly seems to be aware of many people having this issue..but there is no fix. Playing through the aux in is fine, and using external speakers/headphones is fine too. Definitely seems to be a bug rather than a hardware issue. Might have to go back to the volca fm for my couch noodling as the speaker in that tiny thing didn't have this issue !