Help needed with keyframes

I’m working on a project and need help with using python to create an audio visualizer. I need a emission node’s strength to be controlled from a f-curve baked from audio.

This code can so far create the visualizer

import bpy


audio = "C:/path/to/audio.mp3"

### Max frequency
max = 10000


rows = 3
columns = 3


r = 0 
c = 0


for i in range(0, rows * columns):
    if c == columns:
        r += 1
        c = 0
    
	### Create cube grid
    bpy.ops.mesh.primitive_cube_add(location = (r, c, 0))
    bpy.context.scene.cursor_location = bpy.context.active_object.location
    bpy.context.scene.cursor_location.z -= 1
    bpy.ops.object.origin_set(type = 'ORIGIN_CURSOR')
    ###
	
	
	### Scale cubes into bars
    bpy.context.active_object.scale.x = 0.35
    bpy.context.active_object.scale.y = 0.35
    bpy.context.active_object.scale.z = 5
    bpy.ops.object.transform_apply(scale=True)
    ###
    
	
	### Bake audio to scale
    bpy.ops.anim.keyframe_insert_menu(type="Scaling")
    bpy.context.active_object.animation_data.action.fcurves[0].lock = True
    bpy.context.active_object.animation_data.action.fcurves[1].lock = True
    
    bpy.context.area.type = "GRAPH_EDITOR"
    
    step = max/ (rows*columns)
    
    bpy.ops.graph.sound_bake(filepath= audio, low=i*step, high=i*step + step)
    
    bpy.context.active_object.animation_data.action.fcurves[2].lock = True
    ###
	


### Bake audio to emission
	
###
	
	
    c += 1