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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.
When the Lynx Hilo is selected as the output sound device, channels
1&2 are active by default. In this state, audio will be sent to ALL Hilo
outputs simultaneously. If you wish to mute a stream to a particular
output, you can do that from the Hilo Routing Page, as describe in
section 5.3.4: Routing.
2.5.3.2 Controlling Latency by Changing the Buffer Size
Latency in an audio interface can be defined as the time required to process a sample from an application to the interface’s audio
output. A number of factors determine the achievable latency performance of a Hilo USB system: processor speed; operating system;
sample rate; number of utilized record or play channels; system efficiency; etc.
Latency can be manipulated by changing the size of the buffers used to transfer data to and from Hilo. Core Audio buffer size
controls are offered within most pro audio recording applications. With Hilo, buffer sizes typically range between 32 and 2048
samples.
Smaller buffer sizes will give you lower latency. However, if a buffer size is too small for the system or context, audio anomalies such
as clicks and pops may occur. It is recommended to become familiar with altering the Hilo buffer size to best suit the context of use.
Once you determine the lowest achievable buffer size, you will typically have to double the size each time you double the sample rate,
but the effective latency will remain constant. For example, if a system is capable of operating at a buffer size of 128 samples at 48
kHz, then for a 96 kHz project, the buffer size will likely need to be increased to 256 samples.
2.5.4 Installation for iPad
Hilo can connect to an Apple iPad with the camera kit. Hilo will operate as an audio device under iOS automatically without any
driver installation required.
Simply connect the USB cable from Hilo to your iPad, and Hilo will be immediately available for use. There is no capability in iPad
applications to select audio devices. Any audio that plays from the iPad will automatically be routed to the Hilo through the camera
connection kit/USB cable.
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