I fitted proper knobs to my Laney, as a Trace rip-off it originally had little white 'nips'. Rather than fill gaps I fitted proper slider caps. Check out the controls, it's 100% a Trace clone on the outside. Inside it uses op-amp based circuitry, rather than pure transistor like the GP11. Also uses remote FET switches rather than having mechanical ones in the signal path. So strangely its technically more advanced but it doesn't sound as good!
It would be a shame to spoil the TE, but I honestly think these knobs do look better:
Dang, now I'm getting really BAD thoughts about bi-amping, but that would demand another 8R cab... room for a 15" perhaps?