The instrument
The EM-90A Analog Ensemble Mixer with built-in drum machine followed the EM-60, Yamaha's first mixer.
Details
The EM-90A has six channels with 1/4” inputs on the front. It has Line, Guitar, Mic switch for each channel and also Treble, Bass, Volume and a reverb switch, as well A, B, Speaker. The built in Drum Machine has the following patterns: March, Waltz, Swing, Slow Rock, Jazz Rock, Rhumba, Bossa Nova, Tango.