This review kindly written by Tony Long. You can read more reviews like this, along with Tony's productions at his personal site -> Tony Long Music.
DAVE SMITH TETRA - INTRODUCTION
Dave Smith who co-developed the DSI-120 integrated circuit that was used in the famous Prophet 08 in 2007 and the Mopho in 2008, amongst other achievements is also credited with the design of the award-winning small but powerful Tetra. The Tetra which has four DSI-120 circuits, provides us with an analog four-note polyphonic, four-part multitimbral programmable synth at a very affordable price.