The Sunbird library is based on a 1962 Gibson Hummingbird acoustic guitar.
The Hummingbird guitar was created in 1960 by Gibson and was the first square-shouldered dreadnought. It was designed to be extremely versatile so that it can cover many music genres and have a deep tone without being too powerful, which is perfect to accompany a voice.
This guitar was recorded with a pair of DPA microphones to get a detailed stereo perspective, a U87 to capture the Bass and a precise mono perspective and also using a contact pickup in case you want to put the library through an amp simulation plugin.
It was sampled very thoroughly, every frets of each string was sampled with upstrokes, downstrokes, round robins, releases, staccatos, mutes, palm mutes, hand blocks, slides, hammer ons, pull offs, retriggers, fretnoises, percussions and other articulations. All of these details allow Acoustic Samples to reproduce the real sound of playing a Hummingbird guitar.
There are 4 modes (that you can choose using keyswitches, G5 to C6), the solo mode that allows to play melodies, the chord mode that helps playing strums or picking very easily, the patterns mode that does all of the strumming or picking for you and finally the MIDI mode that allows you to use your preferred midi guitar controler.