![](https://www.musicincmag.com/images/gear/SAC_ELE_VTC_RETRO_KI_01.jpg)
The VTC Retrofit Kit includes a stacked potentiometer for treble and bass, a push/pull potentiometer for the passive tone control and a preamp bypass switch. The VTC control is passive, and the maximum setting is a flat EQ. The further users turn the control down, the more the high end in the signal will attenuate.