hi i am trying to build a frequency splitter to separate a signal into 4 bands to be processed individually, then mixed back together. i want to do this so that the bands can be split, mixed back together, then mixed with a phase inverted original of the signal and create silence (or as close to it as possible). what i really need is for the filters to add as little character to the sound as possible. i think i would need linear phase filters for this, but i cant find any and wouldnt know where to begin building them. i looked through the user library and saw bandsplitter, which uses a LP, which is then subtracted from the original signal to give two bands, and repeated to get as many bands as you need. this gives me the exact same sound as i started with, but i noticed that the bands arent split properly, and with steeper filters i actually get a more shallow slope on the "HP" section of the bands. i also tried some EZFFT stuff, but most of that goes over my head, and what i could take from it didnt seem to help me at all. for example, with the EZFFT brickwall filter (which i thought would be ideal to reverse engineer), it seems that with a sine wave attenuated by 100dB, it actually doesnt make much difference to the sine wave. not sure why, but thats for another thread. has anybody got any idea about how to create this band splitter, or a linear phase filter? or a link to a good band splitter or filter i can look at? thanks --- oh and i forgot to say. i would like to have an adjustable slope if i can too. this would just be a switch to select between different filter types (ideally 1-pole to 8-pole). --- sorry to keep adding to this already long thread, but i noticed in the band splitter included with reaktor that there is a unit delay on two of the bands. why is this? maybe that would solve my problem?