Propellerhead Reason - 4.0 Instrukcja Operacji Pobierz pdf (Strona 20)

AUDIO BASICS

About Audio Levels

When playing back in Reason, you should keep an eye on the Audio Out Clip indica-

tor on the transport panel. If this lights up, the audio level is too high, resulting in clip-

ping (digital distortion).

D To remedy this, lower the master level on the mixer (or other device) that

is connected to the Hardware Interface, until Audio Out Clipping doesn’t

light up on playback.

You could also use the MClass Mastering Suite combi to ensure that clipping

never occurs - see page 335.

! Note that it doesn’t matter if the level meters on the individual devices

(effects, mixer channels, etc.) “hit the red”. Clipping can only occur in the

Hardware Interface.

The technical reason for this is that internally, Reason uses high resolution floating

point processing, which ensures high audio quality and virtually limitless headroom. In

the Audio Hardware device, the floating point audio is converted to the resolution

used by the audio hardware, and that’s where clipping may occur.

If you are using multiple outputs

If you are using audio hardware with more than two outputs, you may have different

devices connected to different outputs in the Hardware Interface. If the Audio Out

Clipping indicator lights up, you should play back the section again while checking

the Hardware Interface. Each output socket has a level meter - if the red meter seg-

ment lights up, the output is clipping. Lower the output level of the device connected

to the clipping output, until no clipping occurs.

If you are using ReWire

If you are streaming audio to another application using the ReWire protocol, clipping

can not happen in Reason. This is because the conversion from floating point audio

happens in the other audio application. See page 123 for more information about us-

ing ReWire.

General Information

Master Tune

By default, Reason plays back a “middle A” at 440 Hz, which is the standard tuning in

most instruments. However, if you are playing Reason together with other instru-

ments, you may want to adjust the tuning:

1. Pull down the Edit menu (or Reason menu under Mac OS X) and select Pref-

erences...

2. Use the pop-up menu at the top of the Preferences dialog to select the Audio

page.

3. Adjust the global tuning with the Master Tune control.

If you like, you can adjust this during playback. Note that this affects the tuning of

all sound sources in Reason, including the drum machine and loop player.

About Latency

On any personal computer system, there is a delay between the moment you “ask”

the hardware to play a sound and when you actually hear it. This delay is referred to as

the “latency” of the design. This imposes a problem for any system where you want

real time user input to affect the sound.

! See the “Optimizing Performance” chapter for basic information on ad-

justing output latency!

Why is there latency?

Any audio application creates its audio in chunks. These chunks are then passed on

to the audio card where they are temporarily stored before being converted into regu-

lar audio signals.

The storage place for these chunks are called “buffers” (an analogy would be a

bucket brigade, where a number of people each have a bucket, and water is poured

from one bucket to another to reach its final destination).

The smaller the buffers and the fewer they are, the more responsive the system will be

(lower latency) However, this will also raise the demands on the computer and its soft-

ware. If the system can’t cope up with moving the data to and from the buffers fast

enough, there will be problems that manifest themselves as glitches in audio play-

back.

To make things worse, audio playback always competes with other activities on your

computer. For example, under Windows, an output latency setting that works perfect

under normal circumstances might be far too low when you try to open files during

playback, switch over to another program while Reason is playing or simply play back

a very demanding song.

The indicator will stay lit for a short moment, to make

it easier to spot.

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