Yamaha MO8 Owner's Manual - Page 132

Basic Structure Internal Structure (System Overview) ■ 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. Normal Voice Waveform (Preset 1 - 1859) Velocity Element 3 Element 2 Element 1 Element 4 One Voice Drum Voice C0 C1 C6 Key 1 Key 5 Key 10 Key 18 Key 21 Key 73 Individual drum sounds (different for each key) ■ GM Voices GM (General MIDI) is a worldwide standard for Voice organization and MIDI functions of synthesizers and tone generators. It was designed primarily to ensure that any song data created with a specific GM device would sound virtually the same on any other GM device-no matter the manufacturer or the model. The GM Voice bank on this synthesizer is designed to appropriately play back GM song data. However, keep in mind that the sound may not be exactly the same as played by the original tone generator. ■ Tone generator parameters that produce the Voice sound Among various parameters that makes up one Voice, Oscillator, Pitch, Filter, Amplitude, LFO and three Envelope Generators (PEG, FEG, AEG) shown in the illustration on pages 132 - 134 are the basic parameters for creating the Voice sound. Parameters related to Oscillator, Pitch, Filter and Amplitude determine the three basic elements of the sound- Pitch (how low or high it is), Tone (or its overall sound quality), and Volume (how loud its volume level is) of the Voice. Parameters such as LFO and EG (Envelope Generator) determine the transition in these three basic elements of the sound from the moment the sound starts to the moment the sound stops. In the sections that follow, we'll explain in detail about the sound-related parameters and provide an introduction to the basics of electronic synthesis. ● Oscillator [VOICE] ➞ Voice selection ➞ [EDIT] ➞ Element selection/ Drum Key selection ➞ [F1] OSC This unit outputs the wave which determines the basic pitch. You can assign the wave (or basic sound material) to each Element of the Normal Voice or each Key of the Drum Voice. In the case of the Normal Voice, you can set the note range for Element (the range of notes on the keyboard over which the Element will sound) as well as the velocity response (the range of note velocities within which the Element will sound). For example, you could set one Element to sound in an upper range of the keyboard, and another Element to sound in a lower range. Thus, even within the same Voice, you can have two different sounds for different areas of the keyboard or you can make the two Element ranges overlap so that their sounds are layered over a set range. Furthermore, you can set each Element to respond to different velocity ranges so that one Element sounds for lower note velocities, whereas another Element sounds for higher note velocities. n You can assign the wave with the following operation. [VOICE] → Voice selection → [EDIT] → Element selection/Drum Key selection → [F1] OSC → [SF1] WAVE ● Pitch [VOICE] ➞ Voice selection ➞ [EDIT] ➞ Element selection/ Drum Key selection ➞ [F2] PITCH This unit controls the pitch of the sound (wave) output from the Oscillator. In the case of the Normal Voice, you can detune separate Elements, apply Pitch Scaling and so on. Also, by setting the PEG (Pitch Envelope Generator), you can control how the pitch changes over time. PEG (Pitch Envelope Generator) Using the PEG, you can control the transition in pitch from the moment the sound starts the moment the sound stops. You can create the PEG by setting parameters as illustrated below. When you press a note on the keyboard, the pitch of the Voice will change according to these envelope settings. This is useful for creating automatic changes in pitch, which is effective for example in synth brass sounds. Furthermore, different PEG parameters can be set for each Element or each Key. Pitch Attack Level Hold Level Decay1 Level Sustain Level (Decay2 Level) 0 Hold Attack Decay1 Decay2 Time Time Time Time Release Level Release Time Time Pressing the key (Key on) Releasing the key (Key off) 132 Owner's Manual