Yamaha MONTAGE M6 Operation Manual page 323

BPF6: The combination of a −6 dB/oct HPF and LPF.
BEF
The Band-Eliminate Filter has an opposite effect on the sound compared to the Band-Pass
Filter.
When this Filter Type is selected, you can set the Cutoff Frequency around which the audio
signal is muted or eliminated.
BEF12: −12 dB/oct Band-Eliminate Filter.
BEF6: −6 dB/oct Band-Eliminate Filter.
DualLPF: Two −12 dB/oct Low-Pass Filters connected in parallel. You can edit the distance
between the two Cutoff Frequencies. The result of the filter is shown on the screen.
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