The 01V96 has HPFs and LPFs natively...

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Yes. I measured them to be 12db per octave. I came up with 2 ways to get the slope I wanted. Assigned channels to stereo subgroups with a 100hz high cut then another 100hz cut in the stereo L/R outs.

The 2nd way was the 100hz in the stereo subgroups cut (or L/R) with a parametric filter on the L/R. If I remember right it was around 200 hz low cut with a peq to make the slope steeper.

I copied the phase/slope trace of 3, 24db L/R filters with smaart then modeled from there. I have the traces and settings and will post them if I can find the time in the morning. The setting traces came out the same as the L/R filters.

If a low cut is available in his subgroups then maybe he can try those settings and measure them to see if they will work. I've never tried parametric filters alone. Maybe with a shelving filter.

Send me a QU and I'll give it a try!

Doug