As far as I can work out, there is no way to control the high pass and low pass filters in the Channel Strip Pre Filters via midi CCs. I have extensive Generic Remote mappings set up, as I prefer hardware controllers over the mouse.
So, I’d like to request that remote control of these paramaters is considered for inclusion in future versions.
I have now made a Pre Gain and Filter preset for my Track Quick Controls, which means I can have hardware control over these paramaters - which makes setting up tracks much easier. It is a little bit fiddly, as you say.
I wish I could just reach for the gain knob on my desk and know it was going to adjust the gain on the current channel - without me having to sometimes remind Cubase what I wanted that knob to do. The High Pass and Low Pass filters are particualarly troublesome in this respect. Sometimes they remember that they were switched on when I saved my Template, and they start working straight away. Sometimes I need to open up the Edit Channel dialogue or fiddle with the On/Off knobs that I have mapped - to remind them of their designated tasks!
I love using a hardware console, but sometimes I wonder if it’s more trouble than it’s worth.
Just a quick update to this. Since I’ve updated to Cubase 11, this set up has become a lot more reliable. I can tweak paramaters on my controller now with a degree of confidence that Cubase will respond without any cajoling. So it looks as though support for external controllers has improved considerably, in looks and functionality, which is great.