thanks jinx,
you lightup my mind, below my optimize sample coding after modified, looks
better now, and i like the idea of 'moving averages' but difficult to added
in.,

8 analog split in 2 groups,
Group_A : ext_vref=2.5v, 2.441mV/step, measure range 0~2.5v..
Group_B : ext_vref=2.5v, (2.441mV*16)/step, measure range up to 40v
@ 39.056mv / step , use devided resister 150k//10k..

for i=1 to 10
  raw_value=adc_read(an0)                //: sub call, multiplx and select
an0, read value put in raw_value
  an0_value=an0_value+raw_value
  raw_value=adc_read(an1)
  an1_value=an1_value+raw_value
   raw_value=adc_read(an2)
  an2_value=an2_value+raw_value
   raw_value=adc_read(an3)
  an3_value=an3_value+raw_value

   raw_value=adc_read(an4)
  an4_value=an4_value+raw_value
   raw_value=adc_read(an5)
  an5_value=an5_value+raw_value
   raw_value=adc_read(an6)
  an6_value=an6_value+raw_value
   raw_value=adc_read(an7)
  an7_value=an7_value+raw_value
next i

an0_value=(an0_value/10)*2441 / 1000   //: get back reading in mv range
an1_value=(an1_value/10)*2441 / 1000
an2_value=(an2_value/10)*2441 / 1000
an3_value=(an3_value/10)*2441 / 1000

an4_value=(an4_value/10)*2441 / 1000 *16    //: get back reading in mv range
and 16x
an5_value=(an5_value/10)*2441 / 1000 *16
an6_value=(an6_value/10)*2441 / 1000 *16
an7_value=(an7_value/10)*2441 / 1000 *16
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