Yes, and when you look at the instructions first before your install, you can do all this at first try without guessing 
Recommended wiring and config shown here:
ForceSync app connection Guide shown here: ForceSync User Guide.pdf - Google Drive
— all these links are available in this thread on Crucible: ForceSync app — bluetooth smartphone remote control ), on facebook ShtokCustomWorx and ForceSync app groups, as well as on Proffieboard and BT909 bluetooth module listings from TCSS, SaberBay, KRsabers websites and on lightsaber forums. Also all instructions will be available on my official ShtokCustomWorx website here: ShtokCustomWorx
We now use a 6-digit bluetooth pairing PIN code (000000 by default and it can be changed via Feasycom app, instructions are shown on my Youtube channel: https://youtu.be/-iK350Qns5c , on GHv4 board bluetooth PIN is configured in the ForceSync app directly, I will implement same for BT909 modules a bit later) for all sound boards: GHv4, CFX, Proffieboard so there should be no confusion, forget about 4-digit PIN codes 
Though sometimes iOS and Android system always hints to try a 0000 or 1234 code as default, so just ignore it, it’s a system hard coded suggestion and we can’t remove or change it inside the app, I will be adding a custom popup window in the ForceSync app before pairing, suggesting to use a 6-digit PIN code 000000 by default and not use 0000 or 1234 
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