A-106-1 Xtreme Filter (MS20) : The great sound of the MS-20 filter for your modular

It's a very characteristic filter that can scream, but can sound quite mellow when tamed. One thing to bear mind is that it can be a bit confusing getting this filter to act like a standard low pass filter. This is because the low pass filter is normalled to the high pass filter i.e the signal goes through the low pass filter to the high pass filter. In principle you can set the high pass to zero (12 o'clock on the polarizer control) and the filter will just act as a standard low pass filter. In practice it is quite hard to hit the zero mark on the high pass filter and you get some of that going into the signal, which can dramatically change the sound of the low pass filter at low frequency settings. The easy way around that is to just put an unconnected jack plug into the high pass in. This will then completely bypass the high pass filter and the filter will act as a conventional low pass filter. That was the most confusing thing I found when trying this filter for the first time. Once you've sussed that out it's a great sounding filter with lots of character.

This filter is a must for anyone with a eurorack modular.