Martin’s strings for  Nashville tuning “MSPHT10” was used for FG-150 and I checked the sound.

It’s same as the state that only 12 sterings of 6 of a high-pitched string of a 12 strings guitar, so when playing a cord of a low fret, it’s the feeling such as ringing by the sound when playing at 5 capo or 7 capo.

I shot a video of them, so please see that.