### 2. Cut away the right traces and solder in the parts
Avoid mistakes here at all cost! Be careful and take your time, especially for the traces between the legs of the potentiometers! Do not try to be fast here, it will bite you later on! Make sure to get the positions of the parts exactly right – otherwise things might not work and you have to figure out a panel layout yourself!
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### 3. Solder short bridges on bottom
Use the clipped away legs or enough solder to bridge the marked parts on the bottom:
### 4. Add Cable Connections (both top and bottom)
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## Mods
### 1. Gain Mod
Increase the gain of the whole circuit to allow louder output.
Replace `R6` to get the desired gain. To calculate the total gain calculate: `R6/R5` . For the original circuit with R5 and R6 both beeing 100k this formula equals to a gain of 1.0. A gain of 1 is also called _unity gain_. This means the input has the same level as the output at maximum level. So if you connect 1V at `INPUT1` and turn up all the dials, with unity gain you will get 1V at the output. Because we are summing the inputs in `U1A` this means that if we input 1V at `INPUT1`, `INPUT2` and `INPUT3` and turn all the dials to 100%, we will get 3V on `OUT`.
If we set `R6` to 150k, we calculate the formula `150k/100k` we get a gain of 1.5
