The EXS24 Sampler

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The EXS24 Sampler
ICM P6 SUP: The EXS24 Sampler & Strip Silence
Strip Silence
Strip Silence is a useful function that can speed up workflow considerably,
especially when editing audio files for use in a sampler. It takes an audio file
and removes all the silences, separating the file into several separate
components.
1.
2.
3.
4.
Drag an audio file into the Arrange window from the Audio Bin
With the audio region selected, select Audio > Strip Silence
Select the appropriate parameters and click OK1
Each sound in the audio file should now be presented as a separate
region in the Arrange window
5. Select the required regions (perhaps all of them) and go to Audio >
Convert Regions to New Audio Files
The EXS24 Sampler
The EXS24 Sampler allows the playback of audio files via a MIDI interface.
Voices used
Pitch control
area
Velocity
Offset
X-fade
area
Sampler
Instruments
Menu
Edit button
Modulation
matrix
Envelopes
LFOs
Figure 1. The EXS24 Sampler Parameters window
When the EXS24 is opened, the Parameters window is displayed. This
window offers numerous sample processing and synthesis options. For
example, it provides a filter, three LFOs, two envelopes and a modulation
matrix.
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Alter the threshold to ensure that all intended samples are picked up. Some of the sounds may
overlap. If you need to, try using the Post Release-Time parameter to separate overlapping sounds
(alternatively you can re-record audio at a slower speed to remove any overlaps).
ICM P6 SUP: The EXS24 Sampler & Strip Silence
The EXS24 Sample Edit Window
Clicking the Edit button in the Parameters window (see Figure 1) takes the
user to the Sample Edit window. This is where sample files are imported and
assigned to MIDI keys.
Sample-tokeyboard mapping
details area
Graphical display of
sample-to-keyboard
mappings
Figure 2. The EXS24 Sample Edit window
Files can be imported by selecting Zone > Load Multiple Samples, selecting
the samples required and clicking the Add button, then selecting Done when
finished.
The instrument editor now tries to map the samples to zones. For example, if
the user has asked for three samples to be uploaded, and wishes to play
these samples using the three different keys C1, C#1 and D1:



select Contiguous zones
Zone Width = 1 note
Start Note = C1
The samples will then be mapped to the MIDI keyboard, and the details of the
mappings given the sample mapping details area, as well as graphically
displayed below that window (see Figure 2). The mappings can then be edited
either graphically or through the sample mapping details area.
Sample Mapping Parameters
The ‘Key Range’ for a sample file is used to define the keys that will trigger
that sample. The setting ‘Key’ under ‘Pitch’ gives what is called the root key.
The root key gives the key at which the sample is played at its original speed
(and so pitch).
ICM P6 SUP: The EXS24 Sampler & Strip Silence
For all the keys in the key range other than the root key the sample will either
be slowed down or sped up so that it plays at a different pitch. Here the
sampler has been programmed so that it takes account of the differences in
frequencies between each note on a(n equal tempered) keyboard and alters
the speed of playback of the sample (and so frequency of the sound
produced) accordingly.2
It might be the case that the user wishes to stack several sampled sounds
onto one note so that a pressing a key on the keyboard (or programming a
MIDI key to play) makes several sample files play at once. This is known as
layering. In the example shown in Figure 2 most keys on the keyboard are
mapped so that they play two layered sample sounds, but notes B1-D1 are
mapped so that they play at least four layers of sound.
2
This means, for example, that if the original sample plays at the frequency of a middle C (261.63Hz),
the root note is set to middle C and the sample is stretched to cover D, this D will play back at the
expected frequency (293.67Hz).
ICM P6 SUP: The EXS24 Sampler & Strip Silence
Dealing with Different Sample File Formats
Importing Rex Files
Rex files (.rex and .rx2) are a popular format of sliced audio. Many people
have uploaded rex files that they have made, and these can be downloaded
for free from the web. They can then be loaded into the EXS24 Sampler and
manipulated through the MIDI editors in Logic.
In the Sample Edit window:




Select Instrument > ReCycle convert3 > Extract MIDI Region and Make
New Instrument
Select the ReCycle file
Enter a velocity factor of 100 (this means that louder slices will
generate MIDI notes with higher velocity values)
Select OK
An instrument will now be created with an independent Zone created for each
slice of audio.
It is also possible to take an audio file and slice it up manually, importing the
slices into the EXS24 Sampler for MIDI playback and editing.
Importing SoundFont Files
SoundFonts are a popular file format for holding samples. They are capable of
holding details of several instruments and so are known as SoundFont Banks.
SoundFonts, as well as several other formats, can be loaded into the EXS24
Sampler.
To import a SoundFont:



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Move or copy the SoundFont files into the ~Library/Application
Support/Logic/Sampler Instruments folder
Select the SoundFont from the Sampler Instruments menu (see
Figure 1)4
The SoundFont will be held in a folder named ‘name_of_soundfont
Bank’ in ~Library/Application Support/Logic/Sampler Instruments
Rex files are created in a package called ReCycle.
The EXS24 automatically convert the SoundFont into an EXS sampler instrument. The raw samples
associated with the SoundFont are placed into the following folder: ~Library/Application
Support/Logic/SoundFont Samples.
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