Many different sound boards are available, but many of them will have a number of the same basic features. These include both the aforementioned analog and digital models. They will all have audio level metering, channel inputs for manipulating different sources of audio through the same mixing board, and master controls to handle all of the audio at the same time. All good quality mixing boards will have a minimum of these features. Most of the boards on the market will have a number of other features as well. Some of the boards will have power amps on board, which can eliminate the need to have another amplifier attached to them.