Propellerhead Reason - 4.0 Instrukcja Operacji Pobierz pdf (Strona 22)

AUDIO BASICS

PC Specific Information

About ASIO DirectX, MME and the Sound Buffer

setting

There are three ways for Windows to access the audio hardware:

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 regular sound play-

back (like when Windows goes “bing” on startup) happens via MME.

• Practically all cards come with an MME driver. If your hardware appears in the Sys-

tem part of the Control Panel, you have an MME driver installed.

• Using audio hardware via an MME driver gives you the longest latency figures.

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

Via a DirectX driver

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

ficient routines to access audio.

• Not all audio hardware come with DirectX drivers. However, drivers for some hard-

ware are included with DirectX itself.

• Using a DirectX driver gives you a shorter latency, between 40 and 90 millisec-

onds.

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

installed for your audio hardware.

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

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

Via an ASIO Driver

Most audio cards designed for serious music and audio use come with ASIO drivers.

• Using a card via an ASIO driver can give latency figures as low as 3ms.

• When you use ASIO, only one program at a time can access the card.

✪ More information about ASIO can be found on Steinberg Media Technol-

ogies’ web pages, www.steinberg.net.

About processors

When you run Reason under Windows, the clock speed of the processor is a major

factor determining how many devices you can use at the same time. However, there

are other factors that should be taken into account, and one important such factor is

“floating point arithmetic performance”.

All audio operations in Reason are done with floating point calculations (counting with

decimal numbers rather than with non-decimal numbers, integers) to ensure the high-

est possible audio quality. You can get high audio quality on an integer system too,

but floating point is effective and accurate when it is available.

Intel and AMD processors are fast at floating point mathematics. Some other lower

priced processor have taken shortcuts which reduce their performance in this partic-

ular aspect. This will have noticeable effect on the performance of the program. Our

advice is:

✪ If you plan to buy a computer specifically for Reason, you can play it safe

and choose an Intel or AMD processor. Alternatively, make sure you se-

lect a processor that is renowned for high floating point arithmetic per-

formance!

Mac Specific Information

Under Mac OS X, all communication with most audio hardware can be handled by the

internal built-in audio controller.

D Other options may be available as well, mainly for compatibility with all

possible hardware/software configurations.

Use these only when required.

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