LMMS tutorial on how to sidechain using the FX-Mixer and a peak controller.

Create a melody and add a kick drum:

1. Create a melody with some long notes.
   
   
2. Add a kick every 4 beats.
   
   

Setting up the FX-Mixer:

1. Link the instrument to FX 1:
   1. Go to the Beat+Bassline Editor and click the instrument to open the General Settings menu.
      
   2. Change FX CHNL to 1: .
2. Link the kick drum to FX 2.:
   1. Open the kick General Settings menu.
   2. Change FX CHNL to 2: .
3. Open the FX-Mixer by clicking show/hide FX-Mixer: (F9).
4. Select FX 2 then click the Add effect button on the right side of the mixer: .
   
5. Scroll down near the bottom, select Peak Controller then click Add.
   
6. Right click on FX Fader 1 then left click Connect to Controller...
   
7. Click the circle beside USER CONTROLLER to make it green, then make sure Controller 1 is selected in the submenu.  Click OK.
   
8. Play the song, the FX 1 volume fader should move up and down during the kick drum.
9. Select FX 1 then click the Peak Controller Controls button, a window should pop up.
   
10. Lower the AMT to less then 1/4, you may want to increase or decrease the BASE knob a bit.
    
11. Thats it, you should now know how to sidechain in LMMS!  Play your song, the main instrument volume should lower everytime a kick drum is played.