User Manual

i2M musicport © Copyright 2012 Sonuus Limited 4
Desktop Editor Software Manual
MIDI Architecture Overview
When you connect your musical instrument to the i2M musicport, before any MIDI
messages are sent via USB-MIDI, the signal passes through several processing stages,
shown in Figure 2. Understanding these stages and how they interact will allow you to
get the most from your i2M musicport.
To condition the analogue signal from your instrument without affecting its tone, a high-
impedance input pre-amp is used. Its gain can be adjusted to accommodate signal levels
from a wide variety of musical instruments.
After conditioning, the pitch and other relevant characteristics of the signal are
determined. This forms the basis of what will be sent as
MIDI messages. Exactly what MIDI
messages are sent depends on how this pitch information is processed.
Operating Modes allow you to specify a group of options based on the characteristics of
the musical instrument you are using and what MIDI instruments you are controlling. For
example, an Operating Mode can be optimised for a particular musical instrument, such
as guitar, bass guitar or voice.
Each Operating Mode allows a set of six
MIDI zones (a MIDI configuration) to be assigned
to it, allowing a wide range of creative possibilities to be explored. The system is flexible
so that each Operating Mode can use a different MIDI configuration, or MIDI configurations
can be shared with more than one Operating Mode, depending on your particular
requirements.
Figure 2: Overview of the i2M musicport MIDI architecture. This shows the signal flow
from your musical instrument to your
MIDI instrument.
Musical Instrument Input Pre-amp
Pitch detection
MIDI configuration
a
b
c
d
Mode options
Instrument
Legato detect
Zones
1
2
3
4
5
6
gate
Hold Pedal
pitch-bend
chromatic
range
transpose
constrainer
MIDI channel
USB - MIDI
on
zone hold
MIDI
extend