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Lexicon
A Glass Interface Controller
A glass interface (personal computer, etc.) could take a slightly different approach. With a graphic display
capability and memory (both program and data) to spare, a glass interface can provide more direct and
visually stimulating access to the MPX 1. The glass interface has the option of deriving the tree structure
from the MPX 1 during an initialization phase or of learning the tree structure once then hard (or semi-hard)
coding the Control Addresses to the glass interface elements. The tree structure could still be learned via
MIDI but it would only be used to build a road map into the tree.
Because all aspects of the interface use a common SysEx message (Parameter Data Message), the glass
interface programmer can concentrate on presentation and organization of the information instead of
merely accessing it. Communication traffic could be reduced by doing a one-time build of a parameter
description database.
As a side note, the user interface software in the MPX 1 uses both hard and soft coded Control Addresses
to edit parameters within the box itself.
Device Inquiry
The MPX 1 supports Non-Real Time System Exclusive General Information "Device Inquiry" as defined
in the "MIDI 1.0 Detailed Specification 4.2". When the MPX 1 receives the following message: F0 7E
<channel> 06 01 F7 (where <channel> is the device ID of the connected MPX 1), the MPX 1 will respond
with the following message:
0xF0, 0xFE
<channel>
0x06
0x02
0x06
0x00, 0x00
0x09, 0x00
0x0n
0x0n
0x0n
0x00
0xF7
Universal System Exclusive Non-real time header
General Information (sub-ID#1)
Identity Reply (sub-ID#1)
Lexicon's System Exclusive ID code
Device Family Code
Device Family Member Code (MPX1)
Major Software Version number
Minor Software Version number
Software Development Phase
unused
EOX
MPX 1 V1.10 MIDI Implementation Details
9
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