ExtensionCopies low bins from one input and the high bins of the other. Interpolates.
| bufferA | 
 fft buffer A.  | 
| bufferB | 
 fft buffer B.  | 
| wipe | 
 can range between -1 and +1. if wipe == 0 then the output is the same as inA. if wipe > 0 then it begins replacing with bins from inB from the bottom up. if wipe < 0 then it begins replacing with bins from inB from the top down.  |