This is what I have used to produce 3 sinewaves out of 3 MCP4921 DACs. Cant find an MCP4291

Code:
include "modedefs.bas"
ANSEL      = %00000000 'Disable analog inputs Channels 0 to 7
ANSELH     = %00000000 'Disable analog inputs Channels 8 to 11
WPUB       = %00000000 'Disable weak pull-ups
ADCON0     = %00000000 'A/D Module is OFF
CM1CON0    = %00000000 'Comparator1 Module is OFF
CM2CON0    = %00000000 'Comparator2 Module is OFF
INTCON     = %00000000 'INTerrupts CONtrol
TRISA      = %00000000 'Set Input/Output (0 to 5)
PORTA      = %00000000 'Ports High/Low (0 to 5)
TRISB      = %00000000 'Set Input/Output (4 to 7)
PORTB      = %00000000 'Ports High/Low (4 to 7)
TRISC      = %01000000 'Set Input/Output (0 to 7)
PORTC      = %01000000 'Ports High/Low (0 to 7)
addr var word [90]
addr[1]=2139
addr[2]=2278
addr[3]=2415
addr[4]=2551
addr[5]=2684
addr[6]=2813
addr[7]=2938
addr[8]=3059
addr[9]=3175
addr[10]=3285
addr[11]=3389
addr[12]=3486
addr[13]=3576
addr[14]=3658
addr[15]=3732
addr[16]=3797
addr[17]=3854
addr[18]=3902
addr[19]=3940
addr[20]=3969
addr[21]=3989
addr[22]=3998
addr[23]=3998
addr[24]=3989
addr[25]=3969
addr[26]=3940
addr[27]=3902
addr[28]=3854
addr[29]=3797
addr[30]=3732
addr[31]=3658
addr[32]=3576
addr[33]=3486
addr[34]=3389
addr[35]=3285
addr[36]=3175
addr[37]=3059
addr[38]=2938
addr[39]=2813
addr[40]=2684
addr[41]=2551
addr[42]=2415
addr[43]=2278
addr[44]=2139
addr[45]=2002
addr[46]=1861
addr[47]=1722
addr[48]=1585
addr[49]=1449
addr[50]=1316
addr[51]=1187
addr[52]=1062
addr[53]=941
addr[54]=825
addr[55]=715
addr[56]=611
addr[57]=514
addr[58]=424
addr[59]=342
addr[60]=268
addr[61]=203
addr[62]=146
addr[63]=98
addr[64]=60
addr[65]=31
addr[66]=11
addr[67]=2
addr[68]=2
addr[69]=11
addr[70]=31
addr[71]=60
addr[72]=98
addr[73]=146
addr[74]=203
addr[75]=268
addr[76]=342
addr[77]=424
addr[78]=514
addr[79]=611
addr[80]=715
addr[81]=825
addr[82]=941
addr[83]=1062
addr[84]=1187
addr[85]=1316
addr[86]=1449
addr[87]=1585
addr[88]=1722
addr[89]=1861
addr[90]=1996

                        
'-------------------------------------------------------------------------------
' Variables
SCK     VAR PORTB.6 'Clock pin
CS1     VAR PORTC.0 'Chip Select Active low
CS2     VAR PORTC.1
CS3     VAR PORTC.2
SDO     VAR PORTC.7 'Data Out pin
FREQ    VAR BYTE
SWITCH  VAR PORTC.6
counter    VAR word    
 highbit var word
 lbit var highbit.byte0
 hbit var highbit.byte1
'-------------------------------------------------------------------------------
START:
IF SWITCH THEN 
FREQ = 35 
ELSE 
FREQ = 185
ENDIF  
 for counter  = 1 to 90
  highbit = addr[counter] +20480
  
low cs1
 SHIFTOUT SDO,SCK,msbfirst,[hbit]
 SHIFTOUT SDO,SCK,msbfirst,[lbit]
high cs1 
PAUSEUS FREQ
low cs2
 SHIFTOUT SDO,SCK,msbfirst,[hbit]
 SHIFTOUT SDO,SCK,msbfirst,[lbit]
high cs2 
PAUSEUS FREQ
low cs3
 SHIFTOUT SDO,SCK,msbfirst,[hbit]
 SHIFTOUT SDO,SCK,msbfirst,[lbit]
high cs3 
PAUSEUS FREQ
 next counter
  counter=1
GOTO START:
END
regards
aajgss