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Menu and Dialog Reference

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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:

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

MME driver, you can adjust the latency value by using the Buffer

Size slider or the up/down arrow buttons. The highest and lowest

possible values depend on the driver.

If you are running Reason under Mac OS X using a CoreAudio

driver, you can adjust the latency by selecting a value from the

Buffer Frames pop-up menu.

If you are using an ASIO driver specifically written for the audio

hardware, you can in most cases make settings for the hardware by

clicking the Control Panel button. This opens the hardware’s ASIO

Device Control Panel, which may or may not contain parameters for

adjusting the latency. Usually this is done by changing the number

and/or size of the audio buffers - the smaller the audio buffers, the

lower the latency. Please consult the documentation of your audio

hardware and its ASIO drivers for details!

If you are running Reason on a Mac using the Sound Manager

driver protocol, you cannot change the latency.

OK, so why not just set the latency to the lowest possible value? The problem is

that selecting too low a latency is likely to result in playback problems (clicks,

pops, dropouts, etc.). There are several technical reasons for this, the main one

being that with smaller buffers (lower latency), the average strain on the CPU will

be higher. This also means that the more CPU-intensive your Reason song (i.e.

the more devices you use), the higher the minimum latency required for avoiding

playback difficulties.

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