How MIDI can be used?

Answer 1

MIDI was invented so that Musical Instruments could communicate with each other, and that one instrument can control another. When a note is played on a MIDI instrument, it generates a digital signal that can be used to trigger a note on another instrument. The capability for remote control allows full-sized instruments to be replaced with smaller sound modules, and allows musicians to combine instruments to achieve a fuller sound, or to create combinations such as acoustic piano and strings. MIDI also enables an instrument's sounds to be programmed remotely. Synthesizers and samplers contain various tools for shaping a sound. Filters adjust timbre, and envelopes automate the way a sound evolves over time.[ The frequency of a filter and the envelope attack, or the time it takes for a sound to reach its maximum level, are examples of synthesizer parameters, and can be controlled remotely through MIDI. Effects devices have different parameters, such as delay feedback or reverb time. When a MIDI continuous controller number is assigned to one of these parameters, the device will respond to any messages it receives that are identified by that number. Controls such as knobs, switches, and pedals can be used to send these messages. A set of adjusted parameters can be saved to a device's internal memory as a "patch", and these patches can be remotely selected by MIDI program changes. The MIDI standard allows selection of 128 different programs, but devices can provide more by arranging their patches into banks of 128 programs each, and combining a program change message with a bank select message. MIDI consists of messages about these parameters, and contains no sound. It has nothing to say about the quality of sound that the receiving device produces, or what technique it uses to generate sound. Analog synthesizers that have no digital component and were built prior to MIDI's development can be retrofit with kits that convert MIDI messages into analog control voltages.