I decided to implement fix no. 2. Doesn't make any great difference in speed. (Thank God I've done all this interpolation stuff reusable and already optimized the coefficents calculation inside the filter.)

Now the filter doesn't explode (with low Q settings it never explodes) but the filter still produces some heavy gains when using high Q, very low FC and deep notes. But this may be considered a feature not a bug^^

I'll now think about this gain thing.


have a good night ...