Everything just fine using...
Code:
@ __CONFIG  _HS_OSC & _WDT_ON & _PWRTE_ON & _MCLRE_OFF 


ANSEL = %00010111    ; - dt suggested value



DEFINE OSC 20
CMCON=7
TRISA=%11111111        'set PORTA as all input 
TRISC=%00000001        'set PORTC as all output apart from RC0

DEFINE ADC_BITS  8     ' ADCIN resolution  (Bits)
DEFINE ADC_CLOCK 2     ' ADC clock source  (Fosc/32)
DEFINE ADC_SAMPLEUS 11 ' ADC sampling time (uSec)

INCLUDE "DT_INTS-14.bas"            ; Base Interrupt System
INCLUDE "SPWM_INT.bas"              ; Software PWM module

DEFINE SPWM_FREQ  150                ; SPWM Frequency
DEFINE SPWM_RES   255               ; SPWM Resolution

DutyVar VAR byte[4]

ASM
SPWM_LIST  macro                    ; Define Pin's to use for SPWM
    SPWM_PIN  PORTC, 2, _DutyVar   ; and the associated DutyCycle variables
    SPWM_PIN  PORTC, 5, _DutyVar+1   ; Notice the underscore before variables
    SPWM_PIN  PORTC, 4, _DutyVar+2
    SPWM_PIN  PORTC, 3, _DutyVar+3
  endm
  SPWM_INIT  SPWM_LIST              ; Initialize the Pins
ENDASM

ASM
INT_LIST  macro    ; IntSource,        Label,  Type, ResetFlag?
        INT_Handler   TMR1_INT,  SPWMhandler,  ASM,  yes
    endm
    INT_CREATE                      ; Creates the interrupt processor
ENDASM

@ INT_ENABLE  TMR1_INT              ; enable Timer 1 interrupts

;_____________________________________________________________________________

Main:                               
 ADCIN 0, DUTYVAR[0]
 ADCIN 1, DUTYVAR[1]
 ADCIN 2, DUTYVAR[2]
 ADCIN 4, DUTYVAR[3] 
 GOTO Main
GO GO GO FIGURE IT