LB will not accept MAME default keys for mapping

[CitznFish]

So I have a arcade cab running mame and LB. I am using the default MAME controls for my joysticks and buttons for MAME.

 

However if I try to map LB to these controls they simply do not work (under Tools>Controllers>mappings)

 

So things like Player1 Button 1(P1B1) is mapped to L-CTRL

P1B2 is L-alt

P1B3 space

P1B4 L-Shift

etc...

But when I try to map "Select" in LB and I hit "clear" and then press the correct button on my cabinet, it does not register. It WILL register in notepad so I know these buttons are working and are active.  How do I remedy this issue? I need to use the arcade buttons to select/launch/exit games in LB. 

 

note: I have tried mapping the correct key with a keyboard as well, same result. LB will not accept the input.

INPUT	NORMAL CODES	CODES WITH SHIFT (hold 1 player start)
COIN 1	5
COIN 2	6
START 1	1
START 2	2	ESC
1 RIGHT	R arrow	Tab
1 LEFT	L arrow	Enter
1 UP	U arrow	Key Below ESC (Volume, gamma, etc )
1 DOWN	D arrow	P (pause)
1 SW 1	L-ctrl	5 (Coin A)
1 SW 2	L-alt
1 SW 3	space
1 SW 4	L-shift
1 SW 5	Z
1 SW 6	X
1 SW 7	C
1 SW 8	V
1 A	P
1 B	ENTER
START 1	1
START 2	2	Esc
2 RIGHT	G
2 LEFT	D
2 UP	R
2 DOWN	F
2 SW 1	A
2 SW 2	S
2 SW 3	Q
2 SW 4	W
2 SW 5	I
2 SW 6	K
2 SW 7	J
2 SW 8	L

Edited August 27, 2020 by CitznFish

[Retro808]

That because you are trying to map keys under LB Controller options. That is for Xinput/Dinput game controls. Not for keystrokes. LB does not have a key mapper. That's in BigBox.

[CitznFish]

2 hours ago, Retro808 said:

That because you are trying to map keys under LB Controller options. That is for Xinput/Dinput game controls. Not for keystrokes. LB does not have a key mapper. That's in BigBox.

good to know. I have a lifetime to bigbox but was trying to get it all working in LB first..