New video of Sophie is now up: https://www.youtube.com/watch?v=XOGrdHn7wBU Finally got her head working in a reproducible manner. I had completely broken about seven of her previous micro-servos. But the burnt-out ones weren't the big problem - I just connect suspect servos my Arduino UNO and if my control servo can run the 'Sweep' sketch but the suspect servo cannot, I know it's dead and in the bin it goes. However, one servo was damaged but still working - except it caused some kind of feedback that made all other micro servos connected to the same circuit go haywire - even brand new ones. Luckily the faulty servo in question was old and had spraypaint on it, so I could tell it apart from the others. But that was very confusing - at first I thought it might be related to the small magnets that hold her faceplate on, but this is not the case. Rogue servos are definitely something to watch out for in future. Anyway, now that I have measurable, standardised voltage going into all of the micro servos, I'd like to upgrade her neck again. She can actually shake her head (but not in the above video as it is addressed straight-to-camera), but she still cannot nod her head as it weighs too much and the neck servo overheats rapidly. Heads are relatively heavy things (especially with long hair). The breakthrough with Sophie has been splitting her up into separate subsystems and separate circuits, then focusing on only ONE subsystem/circuit - in my case her head. For a beginner like me, it was just too confusing and labour intensive to attempt programming her head, speech, neck, arms and hands all simultaneously. When errors occured I was having a real hard time pinning down which motors were affected, how badly they were affected and why. Having to tear down one large, complex system is waaaay harder than troubleshooting something far smaller. So focusing only on her head solved this problem. Also her head is the most important subsystem (because headpats) and is highly transportable. I just have to connect her to a laptop now instead of having her chained to my bulky tower PC.