G Bus THRESHOLD sensitivity

Note: Mods are not supported! Once you start modding, we cannot offer troubleshooting support. Make sure your unit is working in the stock configuration before adding any mods.

The THRESHOLD control is one of the few places that the G Bus circuit departs from the original console schematic. This is because, in the years since the console was designed, the world has switched to digital recording and as a result work at higher signal levels. So the THRESHOLD control on the G Bus is dialed in to be less sensitive than the original.

So, if you tend to mix "quiet" or are using an all-analog setup, you may want to make THRESHOLD more sensitive. To do this, you can adjust R3_CB or both R3_CB and R4_CB.

  • R3_CB sets the maximum sensitivity. Decreasing R3_CB makes THRESHOLD more sensitive, while increasing R3_CB makes THRESHOLD less sensitive at the CCW end of the pot. You can think of decreasing/increasing R3_CB like turning the THRESHOLD pot CCW/CW.
  • R4_CB sets the minimum sensitivity. Decreasing R4_CB makes THRESHOLD less sensitive, while increasing R4_CB makes THRESHOLD more sensitive at the CW end of the pot. You can think of decreasing/increasing R4_CB like turning the THRESHOLD pot CW/CCW.
  • R2_CB adjusts the taper of THRESHOLD so that the "sweet spot" is wider. In most cases it's better to leave it as-is.

Fair warning, the stock values were arrived at after much gnashing of teeth and pulling-out of hair. Being a passive network, every resistor in the THRESHOLD circuit affects every other. So you may decrease R3_CB only to find that the control is now too sensitive at the CW end, in which case you need to decrease R4_CB, which in turn makes the CCW end less sensitive, etc. So I recommend replacing R3_CB and R4_CB with trim pots to start, so you won't be replacing resistors too many times. And if you land on a group of settings you really like, please let us know so we can post them here for other users.

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