Audio Units Panel
  1. Choose Audio-MIDI from the main menu.
  2. Choose Audio Units... from the Audio-MIDI menu.

The Audio Units Panel is used for configuring both the Apple DLS synthesizer and Audio Units.

Configuring the DLS Synthesizer

The left side of the Audio Units panel relates to the Apple DLS synthesizer. As you can see from the panel, there are 6 separate DLS Players (each accessing the Apple DLSMusicDevice internal synthesizer.) You can use the Apple build-in reverberator or you can create custom reverberation by settng the reverb type, the mix between wet (reverberated) and dry (original) sounds. To switch between these two options, click on the icon showing the signal path.

- There is a significant CPU cost when using the custom reverberator (and when using as some of the Audio Unit effects mentioned below). If you are operating a slow computer, you probably want to use the built-in reverberation option.

You can also use this panel to choose new soundfonts for each of the DLS Players. To do this, click on the Choose SoundFont pull-down menu in one of the DLS Instrument areas. Any soundfont (.sf2) files that have been installed in your system will appear in the pull-down menu. In the example below, you can see that there are many sound fonts installed in this computer.

Once you have selected your soundfont, then click on the Update Tracks button on the Audio Units panel to update the displays in the Track Setup Panel.

If you want to save our DLS Orchestra (i.e. the 6 soundfonts currently selected), click on the Save DSL Orchestra button. If you want to load an existing DLS Orchestra into the front-most score, click on the Load DLS Orchestra button.

- In order for soundfonts to be loaded by the Audio Unit editor, then need to be installed in your ~/Library/Audio/Sounds/Banks folder or in the system /Library/Audio/Sounds/Banks folder.

To change the custom reverberation characteristics of your DLS synthesizer, click on the radio button beside the desired reverb room type. Next, adjust the mix between the reverberated (wet) signal and the original (dry) signal. In the example below Medium Room was choosen and the reverb mix was set to 75%.

Configuring Audio Units

Audio Units are audio components which can be downloaded or purchased and installed in your computer. Some audio units (such as the Apple DLS and the Apple effects units) are already installed in your computer - others you will need to install. Audio Units are stored in the /Library/Audio/Plug-ins/Components directory.

With the right side of the Audio Units panel, you can choose up to 6 Audio Unit synthesizers and you can engage or bypass 2 effects units linked in a series. To engage or bypass an effects unit, click on the + sign along the blue signal line. In the example below, the top audio unit (which is using the Synful Orchestra component) has the first effects unit (AUMatrixReverb) engaged while the second effects units (AUDelay) is not engaged.

To select a AU synthesizer, use the Select AU Synthesizer pull-down menu - all available AU synthesizers should be displayed in the pull-down menu.

Each AU synthesizer has its own interface which can be displayed by clicking on the Synth Interface button. The interface will allow you to make adjustments and customized configurations to the synthesizer. You can save your settings in a preset by using the Save and Save As buttons, and you can load previously saved presets either with the Load button or by using the Preset pull-down menu.

The Update All Tracks button is used to update the displays in the Track Setup panel. You should click on this button after you have selected a new Audio Unit Synthesizer.

To select a new effects unit, use one of the Select AU Effect pull-down menus to choose your effect. All available effects units can be accessed from these menus. If you want to modify the characteristics of the effects unit, click on the Effect Interface button. In the example below, the AUDelay interface is shown:

You can use the Save, Save As and Load buttons to create or load presets, or you can use the pulldown menus to select any previously saved presets. When you save a preset, you are given a choice (in a pull-down menu) of whether you want to save the preset in your User preset location I>(~/Library/Audio/Presets)or in the Local preset location (/Library/Audio/Presets). Presets saved into your User preset location will only be available to you. Those saved in the Local preset location will be available to you and to other users on your computer.

- At the moment, Audio Unit configurations are saved as preferences rather than as part of the score file. The last configuration of Audio Units you created will be loaded next time NoteAbilityPro is launched.

- Since most Audio Units and soundFonts are created by other developers, there can be no guarantee that they will be stable. If you discover that an installed Audio Unit is crashing the program, remove it from its installed location.

To revert to the default Audio Unit settings, click on the Revert to Default Settings button at the bottom of the panel.

See also

© Keith A. Hamel 1998-2005 - All Rights Reserved