Ultra-portable 6-channel stereo mixer and USB audio interface with built-in synthesizer and sequencer The TX-6 is a professional-grade mixer and audio interface in a compact, portable package. It features 6 stereo input channels, each with a 3-band EQ, filter, compressor, and digital effects. You can also use the TX-6 as a standalone synthesizer and sequencer, with 4 oscillator waveforms, 4 synthesized drum sounds, and tempo sync.