Audio Pro 8R manual Sync Source, Driver Settings ASIO/WDM Buffer Size Windows only

Fast Track Ultra 8R User Guide

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Sync Source

This drop down menu lets you select the clock source of Fast Track Ultra 8R. To synchronize the interface to an external digital source (i.e., the incoming S/PDIF signal), select the “External” setting. To synchronize Fast Track Ultra 8R to its own internal clock, select “Internal.” Please see the box below for more information about the digital input and external clocking.

About External Clock

Digital audio is based on samples. For example, a digital recording at a sample rate of 44.1 kHz contains 44,100 samples, or digital “snapshots,” per second. Each digital audio device has its own internal clock, or crystal, to generate and control the exact rate and timing of these samples during every second. In order for two or more digital audio devices to function together, only one of their clocks can be in control (the Master), while any other devices must be synchronized to that device’s clock (the Slave). Otherwise, the resulting audio will sound distorted, play at the wrong speed, or have clicks and pops.

You can set Fast Track Ultra 8R to run as the Word Clock Master (“Internal”) when digitally connected to other digital audio devices:

Connect the S/PDIF output of Fast Track Ultra 8R to the S/PDIF input of another digital audio device and configure that device to synchronize to its S/PDIF input (making it the word clock Slave).

Alternatively, you can set another device to act as the Word Clock Master and designate Fast Track Ultra 8R to run as the word clock slave:

Connect the S/PDIF output of a 3rd party audio device to the S/PDIF input of Fast Track Ultra 8R. Select ”External” as the clock source setting from within the Fast Track Ultra 8R Control Panel. Fast Track Ultra 8R now runs in sync to the digital S/PDIF signal generated by the other device.

Note that Fast Track Ultra 8R can only receive input signal from its S/PDIF input when the clock setting has been set to “External.” In this configuration, Input channels 7 and 8 receive their signal from the S/PDIF input instead of from Mic/Line Inputs 7/8.

Driver Settings

ASIO/WDM Buffer Size (Windows only)

Latency is defined as the time it takes for your input signal to pass through your audio software and appear at the outputs. This latency can result in a delay that is undesirable when overdubbing to existing tracks.

This drop-down menu lets you select the size of the buffer in samples. Smaller buffer sizes result in lower latency, but may not function well with slower systems, causing clicks, pops and dropouts in the audio playback.

The default buffer size is 256 samples. If you are experiencing clicks and pops in your audio, try increasing the buffer size.

ASIO Direct Monitoring (Windows only)

Many Windows applications that support ASIO 2.0, also support ASIO direct monitoring. ASIO Direct Monitoring allows your ASIO-compatible software to remotely access and control some routing and monitoring functions of the Fast Track Ultra 8R Control Panel. If you prefer to not use ASIO Direct Monitoring, uncheck the box marked “ASIO Direct Monitoring” on this tab. Please refer to your DAW application’s user guide for more information on implementing ASIO direct monitoring.

High Performance Mode (Windows only)

Clicking this box engages High Performance Mode, which further reduces software monitoring latency and also reduces the load placed on your CPU. Most computers support High Performance Mode, however, if you experience any unexpected results (e.g., system instability, unresponsiveness, etc.), disable High Performance Mode. By default, this box is left unchecked.