How do I make a living..lfo..?

Hi, I'm currently writing a 4ch tape music.

My audio samples are mono, so I'm currently using groove and outputting them to 4 channels.
But as you know, this is just 4 same signals going in to 4 channels so the spatial image isn't really there. it still sounds like mono.

So,

how do i make some lfo, or any modulating source that i could put on every signal to get something live, living modulating source..that modulates the delay, and slight pitch.

I want to just make some set of objects that modulates the delay, pitch in the range of some subtle value so i could slap that set of objects and forget about it.

Basically I want every sound to be like a real orchestra.

In orchestra if the violin section plays the note A, because all violins are slightly tuned different and don't play at the same time because its impossible for human we get this rich sound.

I basically want to do that for my sounds.