This is four voices of the Prophet '08 from Dave Smith Instruments, with some additional features:
Audio feedback (for extra grit)SuboscillatorsFour banks of 128 presets each. (The Prophet '08 has two banks.)
The ability to stack four different timbres in one voice. (The Prophet '08 can stack only two.)Stereo or quadraphonic output. (If you choose quadrophonic output, each voice will go to its own audio jack.)This is a very clean and well-cared for instrument. It includes the original power supply, printed manual, and a CD-ROM of preset patch banks, including the original factory presets. As originally shipped, the Tetra came with all 256 preset patches from the Prophet '08, plus 256 more patches new to the Tetra. I selected 128 of these to make room for patches that I downloaded from Dave Smith Instruments and other sources, but I'm happy to restore the factory setup, if that's what you prefer: just include a note with your purchase and I will load the factory patches before I ship.