Midi guitar to hardware synth

Id like to control my synth with midi guitar, not sure How that works…

I have reaper, a tascam us1641 and my korg.

Can anybody tell me How that would work? Thanks

there are differnet ways to do this, but the common factor is to have midi out to your Korg, simultaneously with audio in.
( On iOS you need an extra usb hub and the camera adapter )
The korg can be connected via a USB midi cable. WIthin MIDI Gutiar this cables port can be selected for output. Some synths have builtin USB midi interfaces, for them you dont need that extra cable, it is just a usb cable then,