Please test my Jitter Correction timing

Probably a bit of both for best results.

something along these lines ... not a working code, just an idea

' buff = array of ints to store deltas
' buffsize = size of the array
' code assumes that buff[] is already populated with deltas

'calculate average first
average = 0
For i = 0 To buffsize - 1
  average:+ buff[i]
Next	
average:/ buffsize   ' buffsize cannot be 0 (zero)

' equalize the spike a bit,  
' probably should be done only when the buffer is full
For i = 0 To buffsize - 1
  ' move anything above or below agerage closer by 1/3 distance from it
  vec = buff[i]+(average - buff[i]) / 3
  buff[i] = vec
Next

' recalculate the average again (spikes should be a bit better)
average = 0
For i = 0 To buffsize - 1
  average:+ buff[i]
Next	
average:/ buffsize

Cheers,
Dima