Ah, I finally understand how to work with audio mod now, thanks so much for opening this world of sound for me! (I clearly am a synth novice)
It definitely took me a while to see the potential. On first use, audiomod just seemed to make the sound a bit brighter and fizzy.
The breakthrough was realizing that I dont have to actually be hearing OSC1 to hear its effects on the filter, which led to me playing with OSC 1 at ranges I wouldn't have otherwise.
Now that you have the core down, try modulating OSC 1 in cool ways!