I had sent in my Sig X to Fryette to get the latest official updates .. it also got fresh power tubes (Sovtek KT88) , bias and V1 (Tung Sol) was replaced and the face plate was replaced with the Fryette logo. I got it back a few weeks ago. There was sound changes . all for the better if you ask me. How much is from the updates and how much from the new tubes .. who knows ? It seems the 3 way voice switches are more distinct sounding. It also seems the tone controls have a better range. I have run it thru a lot of sound shapes and gain ranges and so far I like everything. All three channels well do clean and crunch. The rhythm and lead channels well go into high gain. I did notice the harmonics changed and it is warmer now. Still has the great dynamics and I think the feel is better. Funk / country / rock / etc. sounds amazing with this amp. This amp is kind of the best of both worlds. The options and control of a channel switcher .... yet the way it response to my guitar volume control, harmonics and the dynamics of a single channel amp. The bass still seems very focused. The balance of frequencies is working as I tune it in. I wish all amps had this kind of definition. The amp responds very well to the guitar volume and different pickup selections. You can always tell what guitar is plugged in. It does not hide the sound of the guitar . it enhances it. All the switches are very useful to control the sound. You can really control the sound and feel. You can check out the manual and controls on the Fryette web site. Once you learn how the controls work and interact you well understand what useful tools these are. The cleans seem bigger and more full. It has some of the best clean sounds of any amp. Strumming and appegioes all there. The clean channel turned up to overdrive and everything else was more than I wanted. There are some great crunch sounds in the clean channel. The fullness and sounds of the amp was just great. I felt in complete control of the sound. I use the clean channel more like a non master volume amp most of the time. Using the guitar volume and pickup selector to get a wide range of tones. The vintage less gain English style crunch sounds from the rhythm channel are just amazing as are the modern heavy sounds from this channel and everything between. The lead channel also does a lot of voices well. I have never felt like I need a pedal with this channel. It well do a wide variety of lead sounds. This channel can also get some very thick rhythm sounds. I did a side by side with a several other modern amps in a wide range of tones and gain ranges. All the amps have their own taste .... and liked it better than any of them for the big modern sounds and everything else as far as that goes. It has way better dynamics and better tone control than any of these amps for my taste. The way I could control the thickness of the bottom and blend in the the midrange was very impressive. Heading into heavy sounds on a lot of amps they do not cut well in the upper midrange and have poor dynamics. Dynamics are key in my playing. Between the heavy sounds on the rhythm and lead channels I found some of the best sounds I have found from any amp for these sounds for my taste. The tone, definition, articulation, control, dynamics and feel are all there. Every channel has so much usable range. This amp does it all .... clean / edge of break up / crunch / heavy / leads / vintage and modern flavors. Well blending preamp and power amp distortion the control of the sound was the best I have seen. I do not know if this amp would work for everyone as well as it does for me? But this works for me.