How to use Blend3 values in GDScript (Solved...)...

Dad3353

I have a Blend3 series of animations; they work as expected in the Animation Tree Editor (see screenshots...).
I wish to trigger an evolution from one Blend3 state to another, with GDScript. I have used a primitive Counter to increment from one state (-1.0...) to the next state (0.0...); the count works, but the animation doesn't seem to take it on board. I slowed the Counter down (maybe it's too fast for the animation video..?), but it has made no difference.
Here is the script for this animation evolution; what am I doing wrong, please..? How do I get the animation to evolve from 'Idle' to 'Walk'..?

const lc_blen_idle = -1.0
const lc_blen_walk = 0.0
const lc_blen_push = 1.0
var lv_blen = -1.0

func _ready() -> void:
	# Look towards Player
	look_at(Vector3(lv_play.global_position.x,lv_anik.global_position.y,lv_play.global_position.z), Vector3.UP)
	lv_anik.rotate_object_local(Vector3.UP, PI)
	# Adopt 'Idle' animation
	lv_blen = lc_blen_idle (value : -1.0...)
	lv_anim_tree.set("parameters/Blend3/blend_amount", lv_blen) # Idle

func _on_anik_hit_box_body_entered(body):
	# Woken up by a Fireball...
	if body.is_in_group("Fireball"):
		print("Anika jolted...")
		lv_jolt = true
		# Establich Path to follow...
		find_path()
		# From current ('Idle'...) animation, (value : -1.0...)...
		lv_blen = lc_blen_idle
		# Evolve to 'Walk' animation (value : 0.0...)
		# Convert into integers, as 'For' only uses these, it seems...
		for lv_coun in range((lc_blen_idle*100),((lc_blen_walk*100)+1),1):
			print("Count : ",lv_coun)
			# Convert back to 'Float', as 'Blend3' uses Float...)
			lv_blen = float(lv_coun)/100
			print("Blend : ",lv_blen)
			# Set blend amount to Animation Tree; should progress from -1.0 to 0.0...
			lv_anim_tree.set("parameters/Blend3/blend_amount", lv_blen) # lc_text_walk)

I see no transition from 'Idle' to 'Walk' between the screenshot 'Start' and 'End'.
Thanks in advance for any solution offered; meanwhile...
Have a great day.

Dad3353

I found a solution, lurking in a reply to a slightly different question on another Help forum. The animation has to wait for the next video frame to be activated; an 'await' is enough for this
Here is the code, updated, and going through the three phases of the Blend3 animations, from 'Idle', to 'Walk', then 'Push', back to 'Walk', finishing on 'Idle'...
'''

	lv_blen = lc_blen_idle
	for lv_coun in range((lc_blen_idle*100),((lc_blen_walk*100)+1),1):
		lv_blen = float(lv_coun)/100
		lv_anim_tree.set("parameters/Blend3/blend_amount", lv_blen) # lc_text_walk)
		await get_tree().process_frame
		await get_tree().process_frame
	lv_blen = lc_blen_walk
	for lv_coun in range((lc_blen_walk*100),((lc_blen_push*100)+1),1):
		lv_blen = float(lv_coun)/100
		lv_anim_tree.set("parameters/Blend3/blend_amount", lv_blen) # lc_text_push)
		await get_tree().process_frame
		await get_tree().process_frame
	lv_blen = lc_blen_push
	for lv_coun in range((lc_blen_push*100),((lc_blen_walk*100)+1),-1):
		lv_blen = float(lv_coun)/100
		lv_anim_tree.set("parameters/Blend3/blend_amount", lv_blen) # lc_text_walk)
		await get_tree().process_frame
		await get_tree().process_frame
	lv_blen = lc_blen_walk
	for lv_coun in range((lc_blen_walk*100),((lc_blen_idle*100)+1),-1):
		lv_blen = float(lv_coun)/100
		lv_anim_tree.set("parameters/Blend3/blend_amount", lv_blen) # lc_text_idle)
		await get_tree().process_frame
		await get_tree().process_frame

'''
Using two 'await' instructions gives a reasonable delay between the actions in this case, more or less could be used in a different context.
There may be more elegant ways of achieving this result (I'd like to see them...), but this is enough to enable my Project to go forward. Thanks for reading this. :-)