I learned how to create and use a Pulse-Sawtooth Wavetable in Sylenth1 and thought I’d share my findings in a Video:
For those of you who like to read:
Another useful synthesis technique I learned be deconstructing some of Sylenth1’s stock presets is creating a Pulse Sawtooth Wavetable. Sylenth1 might not be a wavetable synth, but with some advanced synthesis knowledge you can build them yourself.
I realised in retrospect, that being able to use this technique and fully understand what it does isn’t only valuable for using this specific technique itself, but also creating all kinds of other sounds and having a better understanding about the waveforms you work with as well as synthesis in general.
Setting up this wavetable is simpel. You just have to use two sawtooth waves, invert the polarity of one of them as well as shifting the phase of one of the oscillators by 180 degrees. These two waves combined form a square wave. Adjusting the volume of either one of the waves now allows you to move along the wavetable between a sawtooth- and a squarewave.
Analysing this process with a spectrogram will reveal that moving along the wavetable from a sawtooth towards a square wave will take away frequencies from the sound and make it sound duller, while moving toward the sawtooth waves adds frequencies to the sound and makes it sound fuller as well as sharper.
Some of your might already know, but I really found out this way: the difference between a sawtooth wave and a square wave is that a sawtooth wave contains all multiples of the fundamental frequency and a square wave only contains every other multiple of the fundamental frequency. You also call these multiples of the fundamental harmonics. The collection of every other harmonic is also called odd harmonics while the other ones are called even harmonics. Ergo a Sawtooth wave contains all even and off harmonics while a square wave only contains odd harmonics.
But what is this knowledge useful for?
Now understanding the background makes clear that moving along the Wavetable is like controlling the amplitude of the even harmonics of the sound. Using this technique allows you to choose something in between a sawtooth and a square wave. So so can get the best of both worlds and find the perfect combination between hollowness and full and sharpness.