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MIDI, the acronym for Musical Instrument Digital Interface, allows for the connection of music synthesizers,
musical instruments and computers. The MIDI standard is based partly on hardware, and partly on a description
of the way in which music and sound are encoded and communicated between MIDI devices. The hardware por-
tion of the MIDI standard defines these types of input/output channels, called MIDI ports and specifies a particu-
lar type of cable (a MIDI cable) that plugs into the ports. The three types of ports defined by the MIDI specifica-
tion are MIDI IN, MIDI OUT, and MIDI THRU. A synthesizer or other MIDI device receives MIDI messages via its
MIDI In port. It also echoes the messages back out through the MIDI THRU port so that other devices can receive
them. MIDI devices send their own messages to other devices via the MIDI Out port.
The information transmitted between MIDI devices is in a form called a MIDI message, which encodes aspects
of sound such as pitch and volume as 8-bit bytes of digital information.
What does all this mean?
MIDI is supposed to be here to make our lives easier. For use with the XP simply use an existing MIDI controller
as a way to make a "Virtual Pedal Board" for your guitar, or use it "live" for vocals, drums and guitars. In the stu-
dio it will communicate with your existing MIDI gear.
In order to use MIDI, the XP’s MIDI data enable switch needs to be turned on. This switch is located in the
global parameters and is titled “CE”. When this is set to “1”, MIDI functionality is enabled. MIDI is off when
“CE” is set to “0” (See Global Parameters section for details)
When you want to change the active effect program of an effect engine, send a program change command on
the channel that the engine is listening in on. The MIDI channel configuration is also located in the global para-
meters and is labeled “Cx” where x is the actual effect engine #. (See Global Parameters section for more info)
When you want to change an active parameter in an effect engine, send data on the appropriate controller
number tuned to that engine’s channel. (see effect parameter chart for details on what the controller numbers
are). If the display mode that is currently selected indicates anything with regard to that controller, the display
will update to reflect the value.
Examples:
1) If changing the effect wet/dry mix and the display mode is on the mix screen, sending controller #96 on the
appropriate MIDI channel will change the mix. You will see the new value display in real time on the display.
2) If changing an effect parameter value (for instance, reverb decay length rd) and the display mode is set to
parameter select, every time the controller messages are sent, the display is updated to display “rd”. This
gives you a visual indication of what parameter the XP processor thinks that you want to change.
3) If changing an effect parameter value and the display modes is set to the value change mode, the numerical
value changes that the continuous controller messages produce is shown on the screen in real-time.
MIDI
MIDI
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