PRELIMINARY - this page is currently being worked on and so is a work-in-progress.
The Strum Fix Plus 5 DUO Strum Direction Jumpers
SFP5 DUO Strum Activation Directions
The Strum Fix Plus 5 DUO can be configured so that the two strum bars either activate the same way when strummed up and down, or can be reversed such that one strum bar will activate as a “down” when strummed down, while the other will activate as an “up” when strummed down (and vise versa), as shown in the picture to the left.
The activation directions are configured by jumper settings on the PCB. The default configuration of any DUOs shipped since June 20, 2025 is the “REVERSED” configuration. Most users find this configuration makes “alt-strumming” easier when playing bass.
Strum Activation Direction Jumpers
There are 4 jumpers on the PCB that are used to set the activation directions. These are “solder bridge” jumpers, meaning that they use solder pads on the PCB which are deliberately shorted together with a blob of solder to connect the pads together.
Schematic
Schematic for the SFP5 DUO PCB. Note that it shows 8 switches, while only 4 are loaded (switches SW1-SW4). Switches SW5-SW8 are for an alternative short-travel tactile switch which is not currently used.
Jumpers for REVERSED configuration
This picture shows the jumpers JP1-JP4 in their default configuration, for “reversed” action.