Transforming Frequencies

I’m new to Math.Net and not very versed in Algebra. I am writing a .Net Xamarin application that generates tones using f.i. a SawTooth wave. I’ve successfully implemented the SawTooth and Sine waves from Math.Net. What I need next is some effects on the sounds like Vibrato, Phase shifting, Tremolo, etc. Are there routines in the libraries that can help me with that?