Audio Effect dsp classes with my own sample by sample edition

Hello, a newbie here. Im creating an audio effect vst plugin that is combination of few audio effects. It will be saturation, filter, delay and reverb. I used Processorchain and StateVariableFilter and Reverb from dsp module. I can’t find saturation and delay. So I would like to implement them with some algorithms. My Question:
Is ther possibility to combine my own algorithm with dsp processors? I operate on Audioblock with process method, and I am not shure how to modify buffer in such situation.

Kind Regards

Well there is a delay-line atleast (since JUCE 6).