EXS 24 Logic Sampler Users Group

On a fine day, 27-03-2003, s007ing wrote:

>The main point which I need clarifying on: when I try to import a
>sample into a new sampler instrument, is it possible (for instance
>with the samples that came with the exs) to make a sample sound at
>every pitch on the keyboard?  When I have tried to import a sound
>(clean guitar) the sample slows down as you lower the pitch, and
>speeds up as you play higher on the keyboard.  Is this the exs's way
>of approximating the pitch via sample speed?  Do I need to purchase a
>sample that has every note of the keyboard sampled seperately or can
>I make the exs24 force a single sampled note to play at each pitch?

Not sure if I understand you fully, but it sounds as if you're a bit 
confused as to what samplers do.  What you describe is exactly what 
_every_ sampler does: a recorded note is played back at original 
pitch/tempo at a certain key (like C3), and if you stretch it across 
the keyboard, higher notes will play a higher pitch by speeding up 
the sample -- and thus shortening it.  Ditto in reverse for lower 
notes.
So a 1 second sample, assigned to "original key = C3" will last only 
half a second when you play C4 and 2 seconds when playing C2.  That's 
the basic principle of sampling and there's little you can do about 
that.

In order to avoid ugly artefacts you thus indeed need several sampled 
pitches -- that's one of the reasons e.g. orchestral libraries 
provide every single note instead of just one.

What you're after is a kind of realtime "pitch change without 
time-stretch".  There is software that achieves this, but note of 
those is (afaik) realtime, since the algorithms involved are rather 
complicated.  Logic's own built-in "Time & Pitch machine" is an 
example of a piece of software that will let you do exactly this.

-- 
Hendrik Jan Veenstra  <h@...>
Omega Art: http://www.omega-art.com