Apple Logic Pro 7 ユーザーズマニュアル
18
Chapter 2
About TDM
TDM Mixer Plug-in
Please ensure that there is only one Mixer plug-in within the
Plug-ins
folder (found
inside the DAE folder), which will be either the
Stereo Mixer
or
Stereo Dithered Mixer
.
You may also have one of the
Surround Mixer
plug-ins residing here, but these Mixer
plug-ins have no function within Logic Pro.
The Stereo Dithered Mixer requires more DSP capacity than the Stereo Mixer. This may
result in a DAE error message (“DSPs maxed out”), when opening older songs with
maximum DSP load. In such cases, you should use the Stereo Mixer plug-in.
result in a DAE error message (“DSPs maxed out”), when opening older songs with
maximum DSP load. In such cases, you should use the Stereo Mixer plug-in.
Changing Global Bit Depth
If TDM hardware is being used, Logic will ask whether you want to use 16 bit or 24 bit
bit depth, when launched. You may change the Global Bit Depth in the
bit depth, when launched. You may change the Global Bit Depth in the
Audio > Audio
Hardware & Drivers dialog box from 16 bit to 24 bit, and vice versa, at a later time.
Note: In many cases, a resolution of 16 bit will be adequate for the individual tracks of a
regular multi-track production. This setting requires less space on the storage medium,
and a lower data throughput capacity for the hard disk, when playing back the same
number of tracks. The 24 bit format is of most benefit on highly dynamic material
(classical music productions, for example).
regular multi-track production. This setting requires less space on the storage medium,
and a lower data throughput capacity for the hard disk, when playing back the same
number of tracks. The 24 bit format is of most benefit on highly dynamic material
(classical music productions, for example).
Converting the Bit Depth
If a song containing audio files of different bit depths is loaded, Logic will display a
warning message. You can change the bit depth (see above), or you may convert the
audio files. Please note that the conversion of 16 bit recordings to 24 bit recordings
does not provide any improvement in sound quality, whereas a conversion from 24 bit
to 16 bit results in the irrevocable loss of the additional dynamic range possible with 24
bit files.
warning message. You can change the bit depth (see above), or you may convert the
audio files. Please note that the conversion of 16 bit recordings to 24 bit recordings
does not provide any improvement in sound quality, whereas a conversion from 24 bit
to 16 bit results in the irrevocable loss of the additional dynamic range possible with 24
bit files.
To convert the bit depth of audio files:
1
In the Audio window, select all of the files to be converted. It may be useful to sort the
audio files by bit depth before making your selection. Once done, choose all files to be
used in the arrangement with the Edit > Select Used function.
audio files by bit depth before making your selection. Once done, choose all files to be
used in the arrangement with the Edit > Select Used function.
2
Select Audio File > Copy File(s).
3
In the ensuing dialog box, you have the option to set the bit depth. After confirming
the dialog, the audio files will be copied—at the selected bit depth.
the dialog, the audio files will be copied—at the selected bit depth.
4
Logic will ask if the references in the current song should be changed to reflect the
copied files, rather than the original files.
copied files, rather than the original files.
5
If you want to work immediately with the current song, you should confirm this dialog.
Save the song with a different name by selecting File > Save As, if you want to retain the
references to the original files in the original song.
Save the song with a different name by selecting File > Save As, if you want to retain the
references to the original files in the original song.