System:
Windows 11
Xbox Riffmaster
RB4InstrumentMapper v5.3.0
GHWT Definitive Edition
What works:
- The guitar connects to the PC and works in Fortnite.
- RB4InstrumentMapper detects the guitar through GameInput.
- In the mapper, live packet data changes when I press frets and strum.
- vJoy is detected and the mapper says it created GuitarvJoyMapper.
- The same vJoy mapper creation behavior repeats across restarts/tests.
What does not work:
- In ViGEmBus mode, input seemed to stop when RB4InstrumentMapper was not the focused window.
- In vJoy mode, joy.cpl shows no button activity at all.
- GHWT Definitive Edition sees the device but cannot bind/use any inputs.
- PacketLogs is not being created even with both Show packets and
- Log packets to file enabled.
What I tried:
- Rebooted the PC
- Re-paired/reconnected the guitar
- Tried both ViGEmBus and vJoy
- Ran RB4InstrumentMapper as administrator
- Verified vJoy was configured
- Tested in joy.cpl
- Confirmed the guitar itself works in Fortnite
Logs attached:
log_2026-04-04_16-38-37.txt

System:
Windows 11
Xbox Riffmaster
RB4InstrumentMapper v5.3.0
GHWT Definitive Edition
What works:
What does not work:
What I tried:
Logs attached:
log_2026-04-04_16-38-37.txt