Tone King Imperial MKII breaking up, tuner doesn't work. What am I doing wrong?

[Kitwn]

Have a look at this recent thread:

Crackling noise using new nameless suite

Could be due to (1) lack of headroom or (2) lack of processing power. To cure 1, reduce the input level of your audio interface, possibly to it’s minimum setting. For 2, start by closing any other process-intensive apps like your DAW, video editor etc. and see if the plugin works OK in standalone mode. If so then you could try adding more memory to your computer. I had to double my laptop’s memory from 8GB to 16GB to have plugins work within my DAW without crackling.