Dave Z
Inspired
I also have experienced a shrill sound after the upgrade in firmware. I performed a parameter reset after the firmware upgrade as well. I play through FRFR speakers, and I made sure power amp and cab sims were enabled. With the power amp disabled, the shrill is lessened - though the sound is more compressed. I also notice that quick palm mutes on high gain amps are much noisier than before during their decay. I tried adjusting the noise gate, but I can't eliminate the buzz and shrill noises after the quick palm mutes. This might be due to my power source, but I was able to use the noise gate before to eliminate these noises. Lastly, while trying to load Smilefan's "Stone in Schon" patch, I get an excess cpu display on the axe fx that causes a horrible buzz. The only way to eliminate the excess cpu message is to reset the axe fx. I tried to bypass all devices in this patch, but even with all devices bypassed the excess cpu message remained.