Propellerhead Reason - 1.0.1 Betriebshandbuch PDF herunterladen (Seite 197)

ABOUT AUDIO ON COMPUTERS

195

ReWire and Latency

When you run Reason as a ReWire slave, it is the other program, the Rewire

master that is responsible for actually creating the audio and playing it back

via the audio card. This means that it is the master program’s latency you will

get as a final result.

! When Reason runs as a ReWire slave, what audio card you have,

what driver you use, and settings you have made in the Preferences

dialog are of no importance at all! All audio card settings are then

instead done in the ReWire master application!

For information on ReWire, see the chapter “Using Reason as a ReWire

Slave”.

Reducing latency

✪ Please note that internal audio under MacOS has a fixed latency of

11ms which is very stable under all normal circumstances. The tips

below are for Windows users and for MacOS users with additional

audio cards.

There are a few general methods for making sure latency is as low as possi-

ble:

➜ Use a card with an ASIO driver.

While this in itself is no guarantee for low latency, ASIO drivers generally

perform better than MME or DirectX.

➜ Select an audio card that supports low latency (small buffers) and

which is known for well written ASIO drivers.

➜ Remove background tasks on your computer.

This might be any background utility you have installed as well as net-

working, background internet activities etc.

➜ Optimize your songs.

You might run into situations where you have to raise the Output Latency

setting to be able to play back a very demanding song on your computer.

Another option would be to actually optimize the song. See the chapter

“Optimizing Performance” for details.

➜ Get a faster computer.

This is related to the point above and only required if you find that you

need to increase Output Latency because your computer can’t really

cope with the songs you try to play.

PC Specific Information

About ASIO DirectX, MME and the Sound Buffer

setting

There are three ways for Windows to access an audio card:

Via an MME (MultiMedia Extensions) driver

This system has been around since Windows 3.0, and it is this type of driver

that is normally installed in the Control Panel and via Plug’n’Play. Most regu-

lar sound playback (like when Windows goes “bing” on startup) happens via

MME.

• Practically all cards come with an MME driver. If your card appears

in the System part of the Control Panel, you have an MME driver in-

stalled.

• Using a card via an MME driver gives you the worst latency figures,

especially under Windows 98.

• Only one program at a time can use a card accessed via MME.

Via a DirectX driver

DirectX is a later system developed by Microsoft to provide developers with

more efficient routines to access audio.

• Not all cards come with DirectX drivers. However, drivers for some

cards are included with DirectX itself.

• Using a card via a DirectX driver gives you a shorter latency, be-

tween 40 and 90 milliseconds under Windows 98.

• If you use DirectX 3 or later, all programs that access the card via

DirectX and make use of the DirectX “secondary buffer” feature can

use it at the same time, and Reason can play in the background.

! Only use DirectX if you are sure that there is a “certified” DirectX

driver installed for your sound card.

• If in doubt, contact your audio card vendor to check whether there’s

a DirectX driver for your card or not.

✪ More information about DirectX can be found on Microsoft’s DirectX

web pages, at www.microsoft.com/directx.

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