[Solved] Volume Increases On 'Off' Note?

On a track which has an LFO automating a filter cut-off, the track volume increases on the ‘OFF’ note of notes around c3 and below.
The increase is less severe if the Q is low on the filter.
Why does the volume increase and can I stop it increasing without having to add a compressor or maximizer… etc?

xrns example: http://www.quickfilepost.com/download.do?get=39c9a3e24210229334e9f0363f485a02

Thanks in advance

doh.

I should actually read the manual ^^.
"This can be useful to soften the effect of cutoff changes applied to sounds with mostly low frequencies. "

Thanks a bunch :)