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AAS Ultra Analog VA-2 Manual

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Audio and MIDI Settings 57
6 Audio and MIDI Settings
This chapter explains how to select and configure Audio and MIDI devices used by Ultra Analog
VA. Audio and MIDI configuration tools are accessed by clicking on the Audio Setup button located
in the lower left corner of the Ultra Analog VA interface and the MIDI button located just below
the MIDI led in upper part of the interface.
Note that in plug-in mode the audio and MIDI inputs, sampling rate, and buffer size are set by
the host sequencer.
6.1 Audio Configuration
6.1.1 Selecting an Audio Device
Audio configuration tools are available by clicking on the Audio Setup button located in the lower
left corner of the Ultra Analog VA interface. The Audio Setup dialog first allows you to select
an audio output device from those available on your computer. Multi-channel interfaces will have
their outputs listed as stereo pairs.
On Windows, the audio output list is organized by driver type. The device type is first selected
from the Audio Device Type drop-down list. If you have ASIO drivers available, these should be
selected for optimum performance. The Configure Audio Device button allows you to open the
manufacturer’s setup program for your audio interface when available.
Once the audio input has been selected, you can then select a sampling rate and a buffer size
from those offered by your audio interface.
6.1.2 Latency
The latency is the time delay between the moment you send a control signal to your computer
(for example when you hit a key on your MIDI keyboard) and the moment when you hear the
effect. Roughly, the latency is equal to the duration of the buffers used by the application and
the sound card to play audio and MIDI. To calculate the total time required to play a buffer, just
divide the number of samples per buffer by the sampling frequency. For example, 256 samples
played at 48 kHz represent a time of 5.3 ms. Doubling the number of samples and keeping the
sampling frequency constant doubles this time while changing the sampling frequency to 96 kHz
and keeping the buffer size constant reduces the latency to 2.7 ms.
It is of course desirable to have as little latency as possible. Ultra Analog VA however requires
a certain amount of time to be able to calculate sound samples in a continuous manner. This time
depends on the power of your computer, the preset played, the sampling rate, and the number of
voices of polyphony used. Note that it literally takes twice as much CPU power to process audio
at a sampling rate of 96 kHz as it would to process the same data at 48 kHz, simply because you
need to calculate twice as many samples in the same amount of time.
… 57 …


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