Thanks for the input Bert, I changed the interrupt to ASM...
Code:
ASM
INT_LIST  macro ; IntSource,    Label,         Type, ResetFlag?
    INT_Handler  CMP2_INT,  _CMP2_Interrupt,  ASM,  YES 
    endm
    INT_CREATE       ; Creates the interrupt processor
ENDASM
and modified my ISR...

Code:
CMP2_Interrupt:   ' COMPARATOR2 INTERRUPT.
BSR=0 
toggle portc.7
TMR1=0
@ INT_RETURN
but I still can't my audio input above 900Hz, without the ISR toggle pin scoping wrong :-(