Capacitors- do they matter much?

It seems that the cryptic component in our electric guitars are the tablet-sized capacitors which are hidden away at the tone pot. To those of us who had not ventured into the body cavities of our instruments, you might not know what is actually being discussed here... Anyway, a capacitor is an electrical component that stores energy in the electric field between a pair of plates (conductors) whose role in many electrical equipment is to store energy. To the average guitar dweeb, you need to know that this energy storage affects the output of your instrument. We hear this output over at our amp as the sound of our instrument so having a capacitor in our guitars affect the sound even when they are left wide open ie. your tone pot dialled up to the max. 

However, do note that the 'energy storage' function is a fundamental understanding of how the capacitor works. In our guitars, the energy storage is used to differentiate frequencies & the general rule here is, the bigger the capacitor value, the deeper sounding it gets. But let's not head to the shops fervently to acquire these capacitors because we know they are indeed affordable components for our guitar mod adventures- some of  our ears cannot detect the tonal differences.