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This was at the default Q of 0.5 so shouldn’t have been that? I should try reduce the gain and see if that makes a difference In case.
I’ll try the modiirq filter as well.
I’m not familiar with Butterworth filter design. Are you able to share a short description of how to achieve that in Vsig land? Everything I found was about the maths or electrical..
Sadly it’s nearly impossible to find Vsig style designs…
modiirq is probably going to work better for high frequency sweeps, though you can't control the Q at audio rate.
One thing that's important to remember is that when you stack up filters you're also stacking up any gain that those filters introduce. (e.g. if you have a Q of 1, you're going to introduce some gain. More sections = more gain) If you want a higher order filter that doesn't introduce gain, you might look at something like a Butterworth filter (you would need to cascade multiple filters for that)