With 5 velocity layers, the Quartertone Guitar is a nice mix of aggressive sounds at the higher velocity layers as you can hear in the Bill Bailey Demo and gentler tones in the middle velocity layers as you can hear in the Arabesque Demo. There are 144 samples with a mix of every note and every other note sampled, except for the last note which I stretched to give extended range.
I found these samples browsing through Freesound.org. They were created by Quartertone from a Yamaha Eterna classical acoustic guitar, recorded with a CAD E100 microphone and are finger-plucked note performances.
They are licensed Creative Commons Attribution and can be used for any purpose including commercial. Please credit Quartertone.