Five channels (pre-amp) including main speakers (right and left), center speakers, rear speakers (right and left) and subwoofer.  5-D PRO Audio independently controlled music and vocal effect to avoid the feedback and create the live sound concert concept.  Vocal from only the center vocal speaker or from the main, rear and center vocal speakers for singing and talking.   CPU controlled effect adjustments for different microphone tones (i.e. Delay, Repeat and Echo).  Vocal effect main and rear speaker separately controlled, the main out effect controlled in front panel and the rear panel.  Special software suite built-In software programming RS-232 to allow computer to operate easily, free download from website.  DSP sound effect, three digital sound effects for customization.  Four microphones input at the same time.   Special effects for microphone including strengthening the delay, repeat and echo.  Special adjustment and customization for digital music key controlled by CPU.  Signal in and out both bypassing and non-bypassing XLR balance functions for audio signals.   Selection for stereo pre-amp.   Portable for standard rack is suitable for audio use by church, school, company conference, café. It is excellent for Karaoke use and equipment rental.