20.12TT is a kind of APP program similar to 20.4Live,T20i Its operation object is the second generation digital mixer product which is researched and developed independently by SEIKAKU, and it controls the device through the way of network connection with iPad. Its main function is as the followings: -16 microphone preamplifiers with dedicated trim control 16 -20 line-level inputs -6 Aux sends(4 Analog aux sends and 2 internal aux sends) -4 subgroups and stereo main outs - All channels Control Room output -2 headphone output -USB record/play in main channel -100mm sliding electric fader -touchable color LCD display -24-bit/48KHz sampling rate -Program, save, load & copy functions -Digital gate -Digital compressor -Digital 4-band full parametric EQ -PAN -Phase reverse -Time delay -Scenes with digital fader and aux position reference -6 DCA for Digital Control Audio Amplifier or MUTE -Remote Control: Ethernet or USB, -Expand socket for option module:  Multi-track USB audio recording module or CobraNet module etc(USB Audio Module or  16in/16out Digital CobraNet module) Requirements: * iPad with iOS9.0 or above. * a wireless router. *20.12TT Device (for control)