I am looking for an octave-band filter which will allow me to adjust the individual gains of each octave band in the range 63 Hz - 8 kHz (8 bands) with as close to a brickwall response as possible (i.e. clearly defined bands with little or no overlap). Failing this, I imagine a multiband compressor would achieve the same effect but I'm struggling to find one which goes above 5 bands (same with EQs, also very few EQs offer the kind of approximate brickwall response I am looking for).
Crucially though, the output of the filter must have no perceptual difference to the input in the case where its parameters are set to leave the input signal unchanged. By this I mean if I run a signal through the compressor with a 1:1 ratio and 0 dB makeup gain, there would be no perceptible change due to phase differences or other spectral artefacts.
This is for an industrial auralisation project and not music production. I understand that this might be too much to ask from a plugin but could anyone point me in the direction of a plugin that will achieve this effect? I'm working in REAPER.