Thanks Johannes,
now what has this to do with the overlap factor ? well, the overlapping blocks need a) also fit into the dsp-tick-scheme and b) overlapping should be done reasonably fast. no with block-sizes being 2^n and overlap-factors being 2^m, the offset between 2 blocks will always be integer 2^(n-m) [n>m]. if you would want an overlap-factor of 3, the offset between to blocks would be 64/3 which would involve some interpolation in order to get the samples "in-between".
perfectly clear, provided someone would, at the appropriate point in the pd manuals/documentation (in Miller's book, in the help file for block~/switch~), state that offset=blocksize/overlap (I asked about the definition of overlap in vain because I couldn't find exactly that information a while ago). This would be particularly useful as overlap is usually defined either as absolute value or percentage of overlapping samples (as the name would suggest) or as offset between subsequent blocks (again either as absolute or relative value).
it's because pd will first cast the input to an integer (1.5 will become
- and afterwards it will check whether the value is 2^n. and 1=2^0
that would be a valuable information in the help file for block~/switch~ as well.
i agree that it should also bail out when getting non-integer values, in order to not confuse people too much.
So do I.
Regards, Matthias