i got it all by myself 
thanks to the perfectly organiced code i was able to discover that the env encoders are linked to a menu position in the file
cs_menu_enc_table.inc
I changed the cursor and page offset.
;; Env “Env” Layer
;; menu offset cursor pos
;; CSENC_ENTRY CS_MENU_L_ENV, 0x01, 0x01 ; Depth
;; CSENC_ENTRY CS_MENU_L_ENV, 0x02, 0x03 ; Attack
;; CSENC_ENTRY CS_MENU_L_ENV, 0x06, 0x08 ; Decay
;; CSENC_ENTRY CS_MENU_L_ENV, 0x09, 0x09 ; Sustain
;; CSENC_ENTRY CS_MENU_L_ENV, 0x09, 0x0a ; Release
CSENC_ENTRY CS_MENU_L_ENV, 0x00, 0x00 ; Depth
CSENC_ENTRY CS_MENU_L_ENV, 0x00, 0x01 ; Attack
CSENC_ENTRY CS_MENU_L_ENV, 0x00, 0x02 ; Decay
CSENC_ENTRY CS_MENU_L_ENV, 0x00, 0x03 ; Sustain
CSENC_ENTRY CS_MENU_L_ENV, 0x00, 0x04 ; Release
After that, all was fine, but now my Env select button wasn´t working anymore.
Aha - it must be pointing to position 0 of the menu where the parameter used to be…
In menu_buttons.inc i found the right lines of code
CS_MENU_BUTTON_Env_Sel_L
;; increment ENV setting
movlw 0x05 ; cursor pos
movwf MIOS_PARAMETER1
movlw 0x00 ; page offset
movwf MIOS_PARAMETER2
call CS_MENU_GetMenuID_ENV ; menu page
goto CS_MENU_ButtonInc
;; movlw 0x00 ; cursor pos
;; movlw 0x00 ; page offset
;; movwf MIOS_PARAMETER2
;; call CS_MENU_GetMenuID_ENV ; menu page
;; goto CS_MENU_ButtonInc
;;
;;
now it´s fine!
I´ll try to get into this some more.
i could find it useful to select the envelope page with the env select button
- then controll the envelope with the ecoders in assign mode (now fitting depth,a,d,s,r)
-and then maybe redirecting the encoders on the env layer to do something alltogether different like controlling the depth of 5 lfos or analog outs, etc.