most popular sounds from the Dance Extreme, Studio Essentials, and Pianos/Classic Keyboards collections. PCM data not available on any other Triton models was also included such as improved pianos and acoustic guitars. The 34MB ROM of the "Classic" was upgraded to 160MB. Valve Force circuitry, using a vacuum tube and an analog ultra gain transistor to allow for warmer, guitar amp-like sounds for more extreme analog overdrive/distortion sounds was included, and proved especially useful for pad and organ sounds, as well as adding depth and realism to acoustic sounds, such as piano. Unlike previous Tritons, which were a white-silver color, the Extreme was finished in dark blue, though, much like with the Korg Trinity Plus and Triton LE, there also was a Special Edition version of the Extreme with a black finish, made exclusive to only the Domestic (Japanese) Market. Like the Triton "Classic" and Studio, the Triton Extreme included a touch screen interface, along with the knob and button controls. A USB interface providing both Type A and Type B connectors enabled external storage and connectivity with a PC, facilitating exchange of samples, sound programs, sequences, and other Triton-compatible files. CompactFlash and microdrive cards up to 8 GB were supported, negating the need to sample directly to RAM. The USB port also allowed control of software synths and host applications via MIDI. However, unlike the "Classic", Studio, and Rack versions, the Extreme could not be fitted with sample expansion boards due to the expansion ROMs having been pre-installed. It was compatible, though, with the MOSS board and up to 96 MB of sample RAM. No SCSI, mLAN or ADAT interfaces were included but optical stereo S/PDIF inputs and outputs were installed. The USB Type A connector can be used to connect a USB thumb drive, hard drive or CD writer drive for making music CDs and loading AKAI format sample libraries. The sequencer was upgraded to facilitate in-track sampling. It is also seen as the keyboard of choice for Tsumugi Kotobuki in the anime K-On!. TR Released in 2006, the TR was similar to the Triton Le but included expanded ROM and additional programs and combinations. It also features a USB cable for data connection with a PC. The TR also features an SD card slot. The piano quality was also improved compared to the "Classic" and Le keyboards. X50 and MicroX The X50 and MicroX, released in 2007,