Can I change the preamp cathode or plate resistors to change the gain or tone of my amp?

通过改变前置放大级的阴极电阻或者屏极电阻，是不是就可以改变增益或者音色？

youdao

Forte features a colour OLED (Organic LED) display to indicate input and output signal levels, mic preamp gain and other useful information, with stylish motion graphics giving you detailed visual information.

ENGADGET: Focusrite launches Forte, 24-bit / 192kHz portable audio interface (video)