Distortion on kick during Simplon filter automation!

[GillyDJ]

I'm doing an 8 bar high pass filter sweep automation using a Simplon (like you would use Autofilter or EQ8) into a breakdown but part way through the automation the kick starts sounding horrible but not sure why?

I've tried reducing the peak (res/Q) but no difference so I only imagin it is filtering frequencies out the kick that is conflicting with the way I've EQ'd it.

In the mix it sounds ok but if I solo the 'low end' group with sub bass and bass tracks it sounds bad and I would imagine on a big system it would sound dreadful.

Kick is quite EQ'd and has a Sonnox Transmod on it.
My group has and EQ8 with 275Hz 1db and 30Hz roll off, a Glue compressor, Sonnox Limiter, the the Simplon automating.

Turning off the plug-ins and devices makes no difference.

Any ideas please?

Thanks

[GillyDJ]

...oh and turning off the plugins makes no difference!

[GillyDJ]

Bump