Tube-Tech HLT2A High/Low Shelving EQ with Tilt Function Electronics so you can quickly change

so you can quickly change between COOL and HOT

Mogami Platinum is excellent for use with acoustic guitar

Truss Rod Yes

And if your amp or switcher has a parallel effects loop

Tube-Tech HLT2A High/Low Shelving EQ with Tilt Function Electronics so you can quickly changeTUBE TECH HLT 2A is a stereo unit, featuring low and high cut filters, low and high shelving filters and a T filter. The shelving filters are designed around a high gain tube amplifier. The T filter is a passive filter placed between the shelving filters and the output amplifier. All three sections are supplied with a in out switch. The low and high cut filters are also passive with a slope of 6dB octave. A bypass switches the whole filter section out