I want to separate the sample from Max Msp into a sine wave.

I saw it on YouTube.
https://www.youtube.com/watch?v=spUNpyF58BY&t=524s

Part of the .
It's in the same context as the photo attachment.

The fft~, pfft~ object was not found or the contents of the MSP Tutorial.
I want to separate the triangle wave or square wave waveform into a number of sine waves, which often appears in the basic signal processing book, but it's blocked in the implementation method.

I'm asking for your help on how to implement it with max.

It doesn't matter if it works as real-time or non-real-time.

I just want to implement that a combined waveform with three different Hz is separated into three.