The Boss Dr. Rhythm DR-880 Rhythm Machine is an easy way to compose complex rhythms. Loaded with 440 drum and percussion sounds and 40 bass sounds from the Roland SRX library, the possibilities are endless. With the Dr. Rhythm, it is easy to automatically add ghost notes or chord progressions. The Groove Modify feature allows various groove and triplet effects to be added. Intricately compose note by note or use the 3 EZ Compose buttons to quickly create original rhythm patterns. This machine comes with a Guitar/Bass input jack so that these instruments can easily play along. The Boss Dr. Rhythm DR-880 Rhythm Machine is complete with 20 velocity sensitive pads that are ready to help you create new and exciting rhythms..