led question, assign to button/CC

[bosone]

i was thinking about adding some led to my midibox controller (since i bought about 100 leds at 2€ at a flea market!)

my midibox setup has become the following:

i have now 7 pushbutton assigned to CC, in toggle mode

i'dl like to add a led below each button, so that when i press the button (CCval=127) the led lights, and turn off when i depress the button (CCval=0)

i see in the main.asm this code:

; This DOUT map allows you to customize the MB64E application to different hardwares
; The MB64E dump structure allows the use of up to 64 LEDs, they are grouped to 8 LEDs per shift register
; Define the used shift registers for the LEDs here
; the shift registers are counted from one - means: 1 for the first, 2 for the second, etc...
; mark unused LED groups with 0
	;; NOTE: by default, the first four DOUT shift registers are used for the encoders
#define DEFAULT_DOUT_SR_PIN_01_08	5
#define DEFAULT_DOUT_SR_PIN_09_16	6
#define DEFAULT_DOUT_SR_PIN_17_24	7
#define DEFAULT_DOUT_SR_PIN_25_32	8
#define DEFAULT_DOUT_SR_PIN_33_40	9
#define DEFAULT_DOUT_SR_PIN_41_48	10
#define DEFAULT_DOUT_SR_PIN_49_56	11
#define DEFAULT_DOUT_SR_PIN_57_64	12

i have 4 shift registers and only one ledring for all my 16 encoders, so i have 2 shift register left. i assume i have to set

#define DEFAULT_DOUT_SR_PIN_01_08	3

then i read this:

; above these buttons LEDs should be mounted to visualize the selected parameter
; (e.g. to visualize the bank which corresponds with the buttons below)
; Define the two shift registers which are assigned to this function here:	
; 0 disables the GP LEDs (not recommented!)
#define DEFAULT_GP_DOUT_SR0	5	; first GP DOUT shift register assigned to SR#5
#define DEFAULT_GP_DOUT_SR1	6	; second GP DOUT shift register assigned to SR#6

i guess these settings are only for the general purpose button function, which i dont' need (i don't want to visualize the bank or so on... only the state of a particular CC assigned to a button)

my question, now, regards where i find and assign the LED  <-> button relation, so that to a particular botton will correspond a definite LED. To complicate the things, the 7 buttons to which i'm referring to are a bit messed up... they are the button numbers 2,3,4,17,18,19,22... so they don't refer to a single shift DIN register...

if it's too complicate i think i will give up! ;-)

thanks anyway!