AIR Music Technology Xpand!2 is an amazing set of tools which is included as a part of Avid Pro Tools. Now with the new version it contains new controls, improved features and an additional GB of sounds. It has been considered as the first choice of the musicians and the music producers.
The great thing about this is that it never stopped evolving itself. It is a multitimbral workstation which offers four active sound slots per fixed. Every fixed has its own MIDI channel, Note Range, Mix, Arpeggiation, Modulation and the Effects settings. It allows you to create your own sound easily and you can quickly browse the parts which are sorted into 29 categories. the creation of sounds and music.