Bedienungsanleitung Lynx Aurora LT-TB (Seite 47 von 55) (Englisch)

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audio to the hardware. However, a higher buffer results in more latency. Also, the higher the

sample rate, the higher the buffer size needs to be. For instance, a buffer size of 128 samples

at a sample rate of 44.1kHz results in 2.9 milliseconds of latency. However, at 96kHz, a

buffer size of 128 = 1.33 milliseconds. Therefore the buffer size needs to be increased as the

sample rate increases to maintain the same level of performance. If the buffer size is too low,

you can experience clicks, pops or distortion in the audio. This is the result of buffer under-

runs, when the audio buffer is momentarily depleted because the computer cannot deliver

samples quickly enough to keep it filled.

Why is latency important? It isn’t in every case. Here are the main conditions where low

latency is important:

* Software input monitoring. This is where you are monitoring through your audio

software the input signals to be recorded. The software is re-directing the input signal back

out to a play device. If the buffer is too high here the performer will hear a noticeable delay

between the notes they are playing and hearing the sound back through the computer. Note

that with the LT-TB, zero latency hardware monitoring is available as an alternative to

software monitoring. See Section 7: Lynx Mixer Reference.

* Virtual Instruments. Generally this would involve using a software synthesizer or other

virtual sound source as an alternative to dedicated hardware like a keyboard or tone module.

Frequently one would play these instruments with some sort of MIDI controller. The delay

between a key being struck and hearing the resulting note from the virtual instrument is a

function of latency.

* Mix Automation. Virtually all DAW applications feature some sort of Mix Automation,

and most allow an external Mix surface or MIDI controller to facilitate mixing within the

software environment. Whether using onscreen faders or a MIDI surface of some sort,

latency will determine the delay between manipulating a fader or knob, and that move being

reflected in the project.

8.3.2 Macintosh OS X

The Aurora will operate as a Core Audio device under OS X. Core Audio is the dominant

audio driver model for OS X, and is used for media playback applications as well as Pro

Audio applications.

8.3.2.1 OS X Audio Applications

The Aurora/LT-TB can be used as a playback device for most popular multimedia, home

theater and pro audio applications. Some such applications allow selection of specific

playback devices. In these cases, an Aurora output device can be selected from the

appropriate device selection menu.

In cases where the playback software does not provide access to output selections, the default

output devices for the operating system will be used. In OS X, the audio out default device

can be established from Applications > Utilities > Audio MIDI Setup.

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