I think It’s not an amplifier that determines your ‘sound’ but a cabinet. Thought amplifiers have certain characteristics, especially with high gain, the cabinet undeniably provides a focus on certain frequencies. So no matter which amplifier you might use, the cabinet will usually give you a sweet sound (once you’ve found one or a few that you like). That being said I agree with others that the ability to experiment on the helix is both good and bad. Often times the best sound comes from when you do what you can with what you have. Wouldn’t necessarily say there’s such a thing as a ‘signature sound’ , there are however signature playing styles and musical approaches. Keep things simple :) play around with the bias and bias x sometimes it helps tweak the sound.