Electrical sound sources are those where the sound originates as an electrical wave generated by some piece of electrical equipment. Many Electronic sound sources cannot be heard at all without the aid of a sound system. If you have enough channels on the mixer, you may connect the left and right signals from the CD, record, or cassette to two mixer channels. Electronic Instruments - Keyboard, Electric Guitar, Electric Drums, etc.
Keyboards output an electronic signal.
If the amplifier has treble and bass speakers, place the microphone half way between them. If it has several full range speakers, place the mike directly in front of one speaker. Another way to connect electronic instruments to the sound system is via an FM transmitter and receiver. This is most appropriate for guitar and horn players that want freedom of movement. The FM transmitter has a guitar cord which plugs into the instrument and the FM receiver has another guitar cord which plugs into the mixer.