Propellerhead Reason - 1.0.1 Manual de Operações descarregar pdf (Página 187)

MENU AND DIALOG REFERENCE

185

Output Latency

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

gram 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 de-

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

the volume of a device, you will not hear this immediately but after the la-

tency 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 lower left corner of 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 slider or

the up/down arrow buttons.

The highest and lowest possible values depend on the driver.

➜ 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 fewer and

smaller the audio buffers, the lower the latency. Please consult the docu-

mentation of your audio hardware and its ASIO drivers for details!

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

fault Output driver, you cannot change the latency.

OK, so why not just set the latency to the lowest possible value? The prob-

lem 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-inten-

sive your Reason song (i.e. the more devices you use), the higher the mini-

mum latency required for avoiding playback difficulties.

Latency Compensation

This control should normally only be adjusted when synchronizing Reason to

external MIDI Clock.

Because of the latency problem, you might need to adjust Reason’s play-

back in relation to the MIDI Clock sync master, so that they are in perfect

time. The tempo will not differ between the two, but Reason might play ahead

or behind the other application. You might need to adjust this. However, this

is something you only need to do once. The setting is stored with your other

preferences, so you don’t need to adjust it again.

Proceed as follows:

1. Set up the other application so that it generates a solid click, on for

example quarter or eighth notes, preferably with a special sound on

the downbeat.

This click can either come from an internal metronome or from a MIDI

source. If you use a MIDI source, make sure you pick one that has solid

MIDI timing.

2. Set up Reason so that it plays a similar rhythm as the other applica-

tion.

You might for example use the Redrum drum computer for this.

3. Start the two applications in sync.

4. Make sure you hear both applications at approximately equal level.

5. Open the Preferences dialog in Reason and select the Audio page.

6. Trim the “Latency compensation” setting until the “clicks” from the

both sources sound at exactly the same time.

7. Close the Preferences dialog in Reason.

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