Moog MP-201 User Manual download pdf (Page 12)

MP-201 User’s Manual

Page 14

MP-201 User’s Manual

Page 15

MIDI

MIDI was developed as a standard way of communicating control signals digitally for

musical devices or software across a MIDI or USB cable. Standard MIDI cables use 5-pin

DIN connectors, and each cable can send MIDI data (MIDI OUT) or receive MIDI Data

(MIDI IN). USB Cables combine both MIDI In and MIDI Out functions. MIDI data is

sent as Messages. There are two categories of messages: Channel messages and System

Messages.

MIDI allows for up to 16 MIDI Channels on each MIDI Cable – thus Channel messages

are assigned to one of sixteen MIDI Channels. The different channels can be used to

address different devices, or different sounds or sound parameters within a single device.

Types of Channel Messages include Note On/Note Off (not used in the MP-201),

Program Change Messages (used to select presets in a device) or Continuous Controller

(CC) Messages. CC Messages are like the CVs of MIDI – they are a control signal with

128 levels. In many MIDI devices, CCs can be used in a manner akin to a CV, changing

pitch or volume for example.

A System Message is a general message and does not address a particular channel. A

System Exclusive (SysEx) message is a type of System message that is dened only for

a particular device, so that other devices will ignore it. That could be the settings of a

particular preset, or the collected settings of a bank of presets, or it could be a larger le

such as a rmware le that updates the operating system of the device. A MIDI CLOCK

message is a type of System Message that is a REAL TIME message and provides tempo

information to other MIDI devices. There are 24 MIDI Clock messages transmitted for

every quarter note. The MP-201 can be set to sync LFOs to various time divisions of a

current tempo by MIDI clock messages.

Please note that though MIDI is a standard communications protocol, it is old (published

in 1983), serial (sends one message after the other), and slow (31.25 Kbaud). The MP-

201 can send out a lot of MIDI data at once, especially when a Preset Channel is set as

an LFO. Some devices and software may not handle this data in a predictable way. It

is up to the user to know and understand the MIDI implementation of a device before

connecting it to the MP-201. Also be aware that MIDI loops (connecting MIDI In to

MIDI Out on two devices) may occur when using the MP-201 with sequencer software.

This should be avoided, especially when using the MIDI USB connection, as MIDI loops

can cause unpredictable behavior.

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Moog MP-201 User Manual Page 12