with a synth

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www.luukmaes.tk

a good start for this would be Rebirth, using a square wave and playing around with the parameters of the sound...

next thing is eqing this sound in order to get the "punsh" like in pro-productions

then compressing the sound and integrating the sound "fitting" into the whole...

Trancevision

oky thx ! I will try it !

Make sure you use a filter envelope that opens and closes during the lenght of the note, for that characteristic throbbing "waaoo" sound