9.2B Mode Messages

There are two messages that determine the MIDI mode (i.e., how devices will receive MIDI data). The "omni" message determines how many channels will be recognized. Omni on means that data from all channels will be received; Omni off limits the number of channels, usually to one.

The "mono/poly" message deals with voice assignment within the synthesizer. In Mono mode, only one note at a time plays in response to voice messages; in Poly mode, as many voices can play notes as are available to play notes.

The SR-16 offers the following:

Omni On/Poly (Mode 1) The SR-16 responds to MIDI data occuring on any channel. Omni Off/Poly (Mode 3) The SR-16 is tuned to one channel and ignores other channels.

9 . 3 SYSTEM COMMON MESSAGES

Intended for all units in a system, some of these messages are:

Song Position Pointer This indicates how many "MIDI beats" (normally a 16th note) have elapsed since a piece started (up to16,384 total beats). It is primarily used to allow different sequencers and drum machines to auto-locate to each other so that if you start one sequencer, the other device will automatically jump to the same place in the song, whereupon both continue on together.

System Exclusive This message (called sys ex for short) is considered "exclusive" because different manufacturers send and receive data over MIDI which is intended only for that manufacturer's equipment.Example: sending an Alesis SR-16 message to an Ensoniq VFX-SD or Roland MT-32 won't do anything but will be understood by other SR-16s. This data often contains information about individual instrument patches (such as the SR-16 Pattern/Song/Drum Set information).

Timing Clock The SR-16 emits 24 timing messages per quarter note. Each device synchronized to the SR-16 advances by 1/24th of a quarter note when it receives the clock message, thus keeping units in sync after they've both started at the same time. However, note that to provide an internal resolution of 96 timing messages per quarter note, the SR-16 internally subdivides the MIDI clock by a factor of four.

Start Signals all rhythmically-based units when to start playing.

Stop Signals all rhythmically-based units when to stop playing.

9 . 4 BOOKS ON MIDI

There have been many books written on MIDI; the following are just a few examples of what's available.

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Alesis SR-16 manual 2B Mode Messages, System Common Messages, Books on Midi

SR-16 specifications

The Alesis SR-16 is a legendary drum machine that has carved its niche in the realm of music production since its initial release in the early 1990s. Renowned for its affordability and user-friendly interface, the SR-16 has become a staple for musicians, producers, and composers across various genres. Its robust set of features and reliable performance make it an attractive choice for both beginners and seasoned professionals.

One of the standout features of the Alesis SR-16 is its expansive library of high-quality drum sounds. It houses 233 onboard drum and percussion sounds, encompassing everything from acoustic drum kits to electronic beats. The samples are derived from real instruments and meticulously recorded to provide a rich, authentic sound that can enhance any musical project. Additionally, the SR-16 allows users to layer and mix different sounds, giving them the flexibility to create customized drum tracks.

The SR-16 employs advanced sequencing capabilities, letting users create intricate patterns and beats with ease. It offers 50 preset patterns, spanning multiple musical styles, which can be edited and modified to suit individual needs. Users can also record their own patterns in real-time or step mode, allowing for greater creativity and control over the final output.

Alesis has designed the SR-16 with a user-friendly interface, featuring a backlit LCD screen and intuitive layout that simplifies the programming process. This accessibility makes the drum machine ideal for live performances as well as studio sessions. Furthermore, the SR-16 includes facilities for triggering sounds via MIDI, enabling seamless integration with other hardware and software setups.

Another notable feature is the onboard effects processing, which enhances the sound quality and provides additional sonic possibilities. The SR-16 includes reverb and filter effects, allowing users to manipulate their sounds and create depth within their musical arrangements.

The compact and rugged build of the Alesis SR-16 makes it suitable for musicians on the go. With its substantial battery life and adaptability for power sources, it is a reliable companion for live performances or recording sessions.

In conclusion, the Alesis SR-16 stands out as an essential tool for anyone looking to expand their musical toolkit. With its high-quality sounds, intuitive sequencing, and versatility, it remains a relevant choice decades after its introduction, merging classic design with modern technological advancements. Whether for crafting beats in the studio or performing live, the SR-16 delivers a unique and engaging drumming experience.