[Discuss-gnuradio] missing internal callbacks

[ematlis]

Hello-

when creating a flowgraph in GRC there are times I would like to change the 
decimation on-the-fly with a gui slider.  However, this does not work because 
the decimation factor in blocks such as the AM Demod or Decimating Fir Filter 
does not have an internal callback (as I understand it).  My main purpose is to 
be able to dynamically change the sampling rate to re-scale the x-axis in a gui 
fft sink while the flowgraph is operating.  Is there a way around this?  Is 
this a necessary limitation, or just something nobody has gotten around to 
implementing?

Thanks!

Eric