Yamaha Mo 8 Manual

Internal Structure (System Overview)
131Owner’s Manual
Basic Structure
The following illustrations may help in understanding the memory structure of the Voices, Performances, and Mixings.
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Preset 1(128 Voices)
12......128
Preset 2(128 Voices)
12......128
Preset 3(128 Voices)
12......128Preset Drum(64 Voices)
12......64
GM Preset(128 Voices)
12......128
GM Drum(1 Voice)
1
User 1(128 Voices)
12......128
User 2(128 Voices)
12......128
Song 1(16 Voices)
12......16
Song...

Internal Structure (System Overview)
132Owner’s Manual
Basic Structure
■Normal Voice and Drum Voice
Internally, there are two Voice Types: Normal Voices and Drum 
Voices.
Normal Voices are mainly pitched musical instrument-type 
sounds that can be played over the range of the keyboard. 
Drum Voices are mainly percussion/drum sounds that are 
assigned to individual notes on the keyboard. A collection of 
assigned percussion/drum waves or Normal Voices is known 
as a Drum Kit.
■GM Voices
GM (General MIDI)...

Internal Structure (System Overview)
133
Basic Structure
Owner’s Manual
●Filter
This unit modifies the tone of the sound output from Pitch by 
cutting the output of a specific frequency portion of the sound.
Cutoff Frequency and Resonance
Here’s how filters work. In the example below (a low pass 
filter), a portion of the signal lower than a given frequency is 
allowed to pass, and signals above that frequency are cut. 
This frequency is referred to as the Cutoff frequency. You can 
produce a relatively...

Internal Structure (System Overview)
134Owner’s Manual
Basic Structure
●Amplitude
This unit controls the output level (amplitude) of the sound 
output from the Filter block. The signals are then sent at this 
level to the Effect block. Also, by setting the AEG (Amplitude 
Envelope Generator), you can control how the volume 
changes over time.
AEG (Amplitude Envelope Generator)
Using the AEG, you can control the transition in volume from 
the moment the sound starts is to the moment the sound 
stops. You...

Internal Structure (System Overview)
135Owner’s Manual
Basic Structure
Part structure of the Tone Generator 
block
The MO plays the sounds in its tone generator block in 
response to MIDI messages received from external controllers 
or sequencer. The MIDI messages are assigned to sixteen 
independent channels, and the instrument is capable of 
simultaneously playing sixteen separate Par ts, via the sixteen 
MIDI channels. However, the sixteen-channel limit can be 
overcome by using separate MIDI “ports,”...

Basic Structure
Internal Structure (System Overview)
136Owner’s Manual
Sequencer Block
This block lets you create Songs and Patterns by recording and editing your performances as MIDI data (from the controller 
block), then playing it back with the tone generator block. The sequencer block can be operated in the Song mode, in the 
Pattern mode, and with the Arpeggio feature. When a Song or a Pattern is played back, the musical data of each sequence 
track is transmitted to the tone generator block...

Internal Structure (System Overview)
137Owner’s Manual
Basic Structure
●Song Mixing
Even if you record your keyboard performance to a Song track, the setup data (non-note events such as voice, pan, volume) which 
for proper playback should be recorded at the top of the Song will not be recorded to it. For this reason, the setup data handled as 
Song Mixing settings should be stored in the Song Mixing Store mode.
Because the Song Mixing is a collection of settings related to the tone generator, it can be...

Internal Structure (System Overview)
138Owner’s Manual
Basic Structure
●Pattern Mixing
Even if you record your keyboard performance to a Pattern 
track, the setup data (non-note events such as voice, pan, 
volume) which for proper playback should be recorded at the 
top of the Pattern will not be recorded to it. For this reason, the 
setup data handled as Pattern Mixing settings should be 
stored in the Pattern Mixing Store mode. Unlike the Song, only 
the voice number is recorded to a track as a Track...

Internal Structure (System Overview)
139
Basic Structure
Owner’s Manual
●Loop Recording (Pattern)
Pattern repeats the rhythm pattern of several measures (1 to 
256 measures) in a “loop,” and its recording is also done using 
loops. This method is used when recording a Pattern Phrase 
using the Overdub method (above). As shown in the example 
below, notes that you record will play back from the next 
repetition (loop), letting you record while hearing previously 
recorded material.
When recording a rhythm...

Internal Structure (System Overview)
140Owner’s Manual
Basic Structure
Effect Block
This block applies effects to the output of the tone generator block, processing and enhancing the sound using 
sophisticated DSP (digital signal processing) technology. 
Effect structure
The effect processing of this synthesizer features the 
System Effects, Insertion Effects, Master Effect, Part EQ 
(Equalizer), and Master EQ (Equalizer). 
■System Effects (Reverb, Chorus)
System Effects are applied to the overall sound,...