In order for the first revision to work properly you need to install one 6K2 resistor and one 1nF capacitor as shown on this picture:

Make sure to solder the switches prior to the vactrols, otherwise you won't have a good time soldering the switches.
| ID | Identifier | Package | Quantity | Pre-populated | Description | Supplier |
|---|---|---|---|---|---|---|
| 1 | U5, U6, U7 | PerkinElmer VTL5C | 3 | VTL5C | Vactrols | |
| 3 | SW1, SW2, SW3 | ToggleSwitch SPDT | 3 | On - On | Switches | |
| 8 | J1, J2, J3, J5, J6, J7, J8, J9 | PJ301M-12 | 8 | PJ301M-12 | Jacks | |
| 9 | J4 | Eurorack Power Header | 1 | EURO_PWR_2x5 | Power Header |