What you get
A single .X7L file. Unlike every other export here, this one
is not a folder of loose parts. X7L is a Yamaha container format, and the
audio is inside the file.
That is also why it is the export that took the most work. The writer is built from byte level reverse engineering of the container and validated against reference files, rather than wrapped around someone else's converter.
Where it goes
The MODX and Montage read libraries from a USB flash drive. Copy the
.X7L to the drive, connect it to the instrument, and load the
library from the instrument's file menu. The exact menu path differs between
MODX, MODX+ and Montage M, so follow the file loading section of your own
manual rather than a generic sequence.
Current limits
Loop points are not written. If a sample in the library depends on a loop to sustain, it will play as a one shot on the instrument. Everything else in the mapping transfers.
Why this export exists at all
Yamaha's own sharing site, Soundmondo, moves Performance data rather than waveforms, so sample bearing libraries are passed around as files instead. Nothing else takes a folder of your own samples and produces a playable MODX library in one step, which is the gap this fills.
The format itself
This guide covers getting the file onto your sampler. For what is
actually inside a .X7L, what else reads it and where its limits
are, see the Yamaha MODX and Montage library format.