M-Audio Profire 610 User Manual download pdf (Page 15)

User Guide 14ProFire 610

AHosted Mode – Sample Rate

This drop-down menu sets the sample rate of ProFire 610. Note that when using the interface with an ASIO

or CoreAudio application, the sample rate can also be determined by your audio application. This parameter

may not be editable from within the ProFire 610 Control Panel if your audio application is running. In this case,

any changes to the sample rate must be made through the audio application itself. If the application does not

provide a way to set the sample rate, quit the application, then change the sample rate through the ProFire

610 Control Panel.

If ProFire 610 is set to External sync, this menu will display the

current incoming sample rate, and selection will be disabled. If

the unit is set to External sync and an error is detected in the

incoming sample rate, the ﬁeld below the menu will display one

of the following two messages:

 • Unsupported – an unsupported sample rate is

detected

 • Unlocked – no valid clock source is detected

If External sync is selected and a sync error is detected, the

Power LED

will blink.

Hosted Mode – 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.

Standalone Mode – Sync Source

This drop-down menu lets you select the digital clock

synchronization source while operating in Standalone Mode.

You can choose to synchronize to the internal clock of

ProFire 610 or to have the interface lock to an incoming

S/PDIF signal.

Standalone Mode – Sample Rate

This drop-down menu lets you select the sampling rate of the

interface when operating in Standalone Mode. Supported

sample rates are 44.1, 48, 88.2, 96, 176.4 and 192 kHz.

If ProFire 610 is set to External Sync in Standalone Mode, the

Sample Rate menu will display “Auto” and the interface will

automatically lock to the incoming S/PDIF signal’s sample rate.

If External sync is selected and a sync error is detected, the Power LED

will blink.

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 ProFire 610 to run as the

Clock Master (“Internal”) when digitally

connected with other digital audio

devices:

Connect ProFire 610’s S/PDIF output

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 Clock Master and

designate ProFire 610 to run as the

word clock slave:

Connect the S/PDIF output of your

digital audio device to the S/PDIF input

of ProFire 610. Select ”External -

S/PDIF” as the clock source setting on

the Settings tab of the Control Panel.

ProFire 610 now runs in sync to the

digital S/PDIF signal generated by the

other device.

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