Mixing Procedural Animation and Animation Montages

Hi,

I am working on my first AI character that uses procedural animation for its basic movement, however, I want to incorporate framed animation sequences for things such as attacking the player or looking around in place. My control rig for the character uses basic IK for 5 bodies (Body + 4 legs (spider thing)). The leg placement and body distance from ground is controlled procedurally, and I believe this is why when I try to make an animation sequence/montage, essentially nothing happens when I call it.
Most tutorials either cover animation through sequences or animation through procedural but never both. I am wondering how people build in attacks and other animations that just don’t seem possible procedurally. Do I need to have built in processes to free up IK rig under certain conditions or is there something simpler I am missing?