Clears bins above or below a cutoff point.
PV_BrickWall.new(buffer, wipe: 0.0)
Arguments:
| buffer |
FFT buffer. |
| wipe |
Can range between -1 and +1.
If wipe == 0 then there is no effect.
If wipe > 0 then it acts like a high pass filter, clearing bins from the bottom up.
If wipe < 0 then it acts like a low pass filter, clearing bins from the top down. |