Propellerhead Reason Specifications download pdf (Page 273)

MENU AND DIALOG REFERENCE

271

Audio Card Driver – Mac OS 9

This menu lists all the available Audio Card Drivers on your system, and lets

you select which one Reason should use. Which option to select depends

on the audio hardware:

D If you are using audio hardware for which there is a specific ASIO

driver, you should select this.

With an ASIO driver written specifically for the audio hardware you will get

lower latency (see below), support for higher sampling frequencies (up to 96

kHz in 24 bit/32 bit float resolution), and possibly better support for addi-

tional hardware features such as multiple outputs.

If there is no specific ASIO driver for your audio hardware, you will use the Apple

Sound Manager. This is the sound driver protocol that comes with the Mac OS,

and Reason communicates with the audio hardware using this.

D If you plan to use the internal audio outputs on your computer,

please select “SM Built-in”.

D If you have some additional audio hardware (such as USB-speak-

ers) installed, please select “SM Device Name”, where “Device

Name” is the name of your audio hardware.

Active Channels (ASIO and CoreAudio Only)

This displays the number of audio channels (outputs) the currently selected au-

dio hardware supports. For a regular stereo card, this number will be “2”. If your

audio card has multiple outputs and an ASIO or CoreAudio driver is selected for

it, the “Channels” button will be available. By clicking on it, you will be able to se-

lect which channel outputs (stereo pairs) should be active. Active outputs will be

indicated in the Reason Hardware Interface.

Clock Source (ASIO Only)

If you are using an ASIO driver for your audio hardware, you have the possibility

of selecting a Clock Source. This is used for determining the source to which

audio playback should synchronize its sample rate. If you have an audio card and

a driver that supports it, you can choose to synchronize to external sources.

ASIO Control Panel (ASIO Only)

If you have selected an ASIO driver, this button brings up a control panel win-

dow specifically for that audio hardware. This may contain buffer settings, rout-

ing options, synchronization alternatives etc.

Sample Rate

This lets you specify the playback sample rate. The options available on this

menu depends on which sample rates are supported by your audio hardware.

Play in Background

When this is activated, Reason will not “release its grip” on the audio hardware

when another application is active.

• The advantage is that Reason will keep playing while you work in the other

application.

• The disadvantage is that other audio applications may not be able to play

any audio, depending on the type of driver used.

Output Latency & Buffer Size

The Output latency is the delay between when audio is “sent” from the program

and when you actually hear it. The latency in an audio system depends on the

audio hardware, its drivers and their settings.

If the latency is large, you will notice that the sound is delayed when you play a

device from a MIDI keyboard. You may also notice that reactions are delayed

when adjusting controls on the device panels (for example, if you lower the vol-

ume of a device, you will not hear this immediately but after the latency time).

Therefore, you want to get as low a latency value as possible.

When you select a driver, its latency value is automatically reported and dis-

played in the Preferences-Audio dialog. Depending on the audio hardware and

the driver, you may be able to adjust this value:

D If you are running Reason under Windows using a Direct Sound or

MME driver, or Mac OS X using a CoreAudio driver, you can adjust

the latency value by using the Buffer Size slider or the up/down ar-

row buttons. The highest and lowest possible values depend on the

driver.

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Propellerhead Reason Specifications Page 273

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