E-Mu PROTEUS FX Manual do Utilizador Página 115
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7 - Synthesizer Basics
Dynamic Filters
E-MU Systems 115
If an envelope generator is used to control the cutoff frequency of a filter, the frequency
content can be varied dynamically over the course of the note. This can add animation
to the sound as well as simulate the response of many natural instruments.
Parametric Filters
A more complex type of filter is called a parametric filter or Swept EQ. A parametric
filter allows control over three basic parameters of the filter. The three parameters are:
Frequency, Bandwidth, and Gain. The Frequency parameter allows you to select a range
of frequencies to be boosted or cut, the Bandwidth parameter allows you to select the
width of the range, and the Gain parameter either boosts or cuts the frequencies within
the selected band by a specified amount. Frequencies not included in the selected band
are left unaltered. This is different from a band pass filter which attenuates (reduces)
frequencies outside the selected band.
Another parameter sometimes used on a parametric filter is Shelving. Shelving simply
widens the passband so that it extends to the limit of the upper or lower frequency
range.
The parametric filter is quite flexible. Any range of frequencies can be either amplified
or attenuated. Several parametric sections are often cascaded in order to create complex
filter response curves.
If four parametric filter sections were cascaded, it would be possible to create the
following complex filter response.
Many natural instruments have complex resonances which are based on their sound-
board or tube size. The resonance shown above would be impossible to create using a
normal synthesizer filter.
Boost
Cut
Freq.
0 dB
+18 dB
-18 dB
Bandwidth
Frequency
Amplitude
Parametric
Filter
10
Linear Frequency - Hertz
dB Magnitude
-5
0
5
15
20
500 10,000 15,000
20,000
4 Parametric Equalizers
- E-MU Systems 1 1
- Operation Manual 2
- Table of Contents 3
- 4 Proteus VX Operation Manual 4
- E-MU Systems 5 5
- 6 Proteus VX Operation Manual 6
- E-MU Systems 7 7
- 8 Proteus VX Operation Manual 8
- Introduction 9
- System Requirements 10
- Software Installation 10
- Setting up Cubase LE 11
- and Proteus XVSTi 11
- MIDI Channel 15
- On Your Own 16
- Proteus VX 16
- Main Window 16
- Troubleshooting Checklist 17
- Setting up the Preferences 18
- Audio Preferences 19
- Headroom/Boost 20
- VST Output Buses 20
- MIDI Inputs 21
- MIDI Response 21
- Controllers 22
- Other Settings 23
- E-MU Systems 25 25
- 2 - Guided Tours 27
- Multisetup Page 28
- Single View Close-up 29
- Channel 1-16 View 30
- Adjusting the Controllers 31
- Create Your Own Custom Bank 32
- Save and Save As 33
- Proteus VX Bank Structure 33
- The Librarian 34
- Find your Files 35
- Load your Files 35
- The Multisetup 37
- Saving your Multisetup 39
- The Output View 41
- Global Controls 42
- Proteus VX Aux Bus Routing 43
- Filter Descriptions 44
- E-MU Systems 45 45
- Preroll RAM Used 46
- CPU Meter 47
- Number of Samples Playing 47
- Current Channel 47
- Working with Multisetups 48
- E-MU Systems 49 49
- 4 - Preset Editor 51
- Preset Globals 52
- Capture MIDI Controllers 53
- TwistaLoop Lock To Tempo 53
- Initial Tempo 53
- Tuning Tables 54
- E-MU Systems 55 55
- Preset Modulators 56
- Templates 56
- Channel Lag 1 & 2 Rate 57
- Poly Key Timer 57
- Channel Ramp 58
- 5 - Effects 59
- Programming Effects 60
- Adding an Effect to a Preset 61
- FX Routing 63
- Effects Overhead 64
- Typical Effects Usage 64
- VSTi Bus Outputs 64
- Main Output Window 65
- Aux FX Screen 67
- Preset FX Screen 68
- E-MU Systems 69 69
- E-MU Systems 71 71
- Effects Listing 72
- Effects Descriptions 72
- Early Reflections Reverb 73
- Reverb Lite (mono) 74
- Background: Chorus 75
- Modulation Parameters 75
- Chorus / Delay 76
- Compressor 77
- Delay Mode: 79
- Discrete stereo 79
- Feedback 80
- Delay (BPM) 82
- (stereo) 88
- Pitch Shifter (mono) 89
- Ring Modulator 90
- Modulator 91
- TremFilter 92
- Tremulator Waveforms 93
- Drag & Drop 98
- Changing Settings 98
- Main Display View 100
- Tree View 100
- Refresh (F5) 101
- Context Sensitive Menus 101
- Undo/Redo 101
- View Menu 102
- 6 - Controls 102
- 7 - Synthesizer Basics 103
- Modulation 104
- Modulation Cords 105
- Envelope Generators 106
- Inverted Sawtooth 107
- Sawtooth 107
- Random Sources 108
- Clock Modulation 108
- Function Generators 109
- Modulation Destinations 110
- Modulation Processors 111
- Dynamic Filters 112
- Frequency 113
- Amplitude 113
- Parametric 115
- The Z-Plane Filter 116
- E-MU Systems 117 117
- Preferences 118
- Voice Edit 118
- MIDI Program Change Commands 119
- MIDI Modes 119
- 8 - Appendix 121
- Toolbar Functions 122
- MIDI Implementation Chart 123
- See note 126
- Received Channel Commands 127
- Special Notes: 127
- Controller Functions 128
- Numerics 129
- E-MU Systems 131 131
- E-MU Systems 133 133
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