The Martin OMC-16OGTE is an acoustic-electric guitar that features a solid Sitka spruce top and solid ovangkol sides. The back boasts solid ovangkol wings with a solid East Indian rosewood wedge for a superb blend of tonewoods. This Martin guitar also features 5/16" hybrid scalloped "X" bracing for enhanced projection, control, and tonal clarity. The guitar's onboard Roland AP-1 preamp provides a superb plugged-in experience. The preamp uses Roland's Composite Object Sound Modeling technology to produce three body-specific tone variations. The preamp has a programmable 7-band EQ, anti-feedback control, digital chromatic tuner, digital reverb, and LCD display. Includes case.