What makes things hard?

[icecycle66]

I was just perusing the projects page looking for sale items when I noticed this.

Fuzzes are easy, low part counts I guess.

Distortion is medium, mid grade amount of parts.

Filter and modulation is hard, lots of parts plus complicated biasing.

What is it that makes manipulating a signal to modulate so complex?

[alanp]

The troubleshooting. More specifically, the LFO.