This guitar is upgraded with Adirondack Spruce brace wood (in place of the usual Sitka). What does that do to the sound? Well, OM1s don't need much help to begin with -- but we've found that Adirondack braces under a Sitka top give the guitar a little more punch and responsiveness. If you play with a flatpick but favor the OM body shape, you'll find plenty to love here. The voice is perfectly crisp, with a woody fundamental.