Made in 1995 this is a GREAT sounding analog mixing console. Old school sound that has caused many studios to hang onto this unit for that "vintage" sound. My uncle used this for years in his professional recording studio. I have had it in my hobby studio for a number of years as well. Phantom Power on board and everything works great. There is a missing slider knob and one blue twist knob (as you can see). I have a pdf/print out of the original manual for it as well. (from the manual) Introduction: Features of the MX400 Each of the mono input channels provides the following functions. • XLR/phone input jacks • 20dB pad switch / continuously variable gain control • 3 band EQ (with variable mid-range frequency) / EQ on/off switch / high pass filter switch • TRS insert jack / direct output • A total of 5 AUX SEND systems (pre × 2, post/pre × 2 (switchable), post × 1) • ODD/EVEN group and stereo assign switch / pan control • Channel ON switch • PFL switch • Level meter for accurate level control In addition to the mono input channels, 4 sets of stereo input channels are provided, with the following functions. • Four stereo inputs with 2 band EQ • GROUP/AUX/STEREO assign switches • Balance/pan control • TRS 1/4” phone jack and RCA input jack select switch (only for stereo input 1/2) The master section provides the following features. • Five fader-style AUX SEND controls • Independent 3 point level meter for each AUX SEND control • TO ST switch and pan control for each GROUP • GROUP ON switch, AFL switch, and 100 mm fader for each GROUP • The MONI/ST2 switch allows the ST2/MONI OUT output signal to be switched in the following two ways; 1) One of the signals from an external source input to the stereo bus, the PFL bus, or the 2TR IN. 2) The same signal as the ST1 OUT output signal. • ON switch, L+R switch, and fader are provided for the ST2/MONI OUT output signal. In addition, the following functions are provided. • XLR mic inputs • Talkback level control • Assign switch The TAPE IN jacks and REC OUT jacks have level controls, for convenience when you need additional margin for monitoring or recording. The level meters with peak indicators allow accurate monitoring.