I must say that I was a little dissapointed when I first got my Overtone.
Afterall, I had waited 13 weeks and mine did not sound like any of the clips I had heard. Little did I know that they all require some fine tuning. However, that is also what makes them great amps. They can be tweaked to your liking.
I would suggest that anyone wanting to change their tone to try different preamp tubes. Huge difference!!!! I wanted cleans so I change all of them to EH Ay7. This created great cleans but not enough grind on the OD. One thought was to turn up the internal trimmer but decided against this. After reading a lot of information I decided to set the trimmer on 10. So in doing so I need to change more tubes. Now V1 has tung-sol 12ax7 ,V2 has 5751 and V3 has EH Ay7. Now it sounds killer and I am considering changing the JJ power tubes to SED 6l6GC. Many thanks to all of you who have guided me in my tone quest. It will never be over but I am getting closer everyday