Propellerhead Reason Spécifications télécharger pdf (Page 65)

SYNCHRONIZATION

If Latency Compensation isn’t enough

There might be situations where you can’t compensate enough in Reason to

make two software applications run in sync. This might especially be true if the

other application is an audio sequencer, that is if it can record and playback both

audio and MIDI.

This problem is an indication of the fact that the other application has not been

set up properly and that its audio playback is not in sync with its own MIDI play-

back.

! This is not something that you can or should compensate for in

Reason. Instead, follow the instruction included with the other ap-

plication to make sure its MIDI playback and audio playback are

correctly locked to each other.

About the beginning of the Song

Due to the latency phenomenon, described on page 282, Reason needs some

time to correct it’s playback speed when it first receives the Start command.

This can be noted as a small glitch in the audio playback, when the program

starts. If this is a problem, you need to insert a couple of empty measures at the

beginning of the Song. Proceed as follows:

1. Set the Left Locator to “1 1 1” and the right Locator to “3 1 1“.

2. Click somewhere in the main sequencer area to move the menu fo-

cus to the sequencer.

3. Select “Insert Bars Between Locators” from the Edit menu.

4. Set up the other device/application, so that it also plays two empty

bars at the beginning.

About MIDI Song Position Pointers

MIDI Clock actually consists of five type of messages: The actual clock (the met-

ronome that establishes the tempo), Start, Stop and Continue commands and

Song Position Pointers. This last type of message contains information about

positions, so that a program for example “knows” where in a Song to start play-

back from.

Normally, this ensures that you can locate to any position and activate playback

from there. In older devices, Song Position Pointers might not be implemented.

This means that you will be able to synchronize properly only if you start both de-

vices from the absolute beginning of the song.

About Tempo Changes

Again, due to the latency phenomenon, Reason needs a bit of time to adjust to

changes in tempo. If there are abrupt changes in the MIDI Clock, due to drastic

tempo changes in the master, you will note that Reason will require up to one

measure to adjust itself to the change. How long this actually takes also de-

pends on the precision of the incoming MIDI Clock. The more precise it is, the

faster Reason can adjust to it.

If this adjustment is a problem, try to use gradual tempo changes rather than im-

mediate ones.

! When Reason is synchronized to MIDI Clock, there is no Tempo

readout.

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Propellerhead Reason Spécifications Page 65

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