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  Drum Filter and Pitch Shifting  
     
  Stage 1  
  Boot up your music software and load in a chopped up drum loop. I am using logic Audio 5.5 and the EXS 24 software sampler.


 
loaded Amen drum loop
     
  The next thing to do is to lay down the loop into the matrix display.  
  I have put down a pattern and made it 2 bars long. listen to clip 2 bar drum loop audio clip  
matrix diplay of 2 bar drum loop
     
  Next we will loop the bar twice and then go back to the main screen. We now have 8 bars of a drum loop ready to be manipulated.

 
matrix diplay of 4 bar drum loop
     
8 bar drum loop
     
  Stage 2  
  now for the fun part. Go back into your software sampler and change the tune or pitch to +12 . we have now changed the pitch to one octave higher than it should be. From here we need to go back into the main screen and do some midi automation.

  
changing pitch to plus 12
     
  Setting up the Midi Automation  
  Go into the menu view and choose track automation or wherever it is in your software package.
next choose coarse tune and the display should look something like this.

  
     
  Here is what it should look like in the Main screen with Midi Automation turned on

 
     
  Stage 3  
 

On to the final stage now. What we want to achieve is a sweeping pitched loop from +12 transpose back down to 0 . This will mean we have sweeped the pitch a full octave down from a higher position. In order to do this we need to grab the line at the end of the loop and drag it down to the zero point like this

 
  Drag the line by holding it down with the mouse. Pull it down untill it reaches the zero mark

 
     
  We have now completed the sweep and it should sound something like this finished pitch sweep  
  I like to normally sweep down or up a drum loop over a shorter distance.
  
     
  Now that we have our sweeping pitch we can always change the way it sweeps. up and down sweep 1  
 

Here is a nice technique i use to add spice to a sweep up and down sweep 2

  
     
  We now have a drum loop with a good sweeping pattern. The next step is to add some effects to the the drum loop.  
     
  Part 2 : Adding Effects To The Sweeping Drums  
     
     

 

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