this one is very similar compared to the ROT plug-in from the rare Waldorf AFB-16 hardware filter box.

The ROT has an integrated sequencing section, which is nice but also a bit unflexible, I wanted to improve it a bit, so the MSF-1 for the scope platform is triggered by standard midi notes, which allows you to alter the sound of the filter through your whole track. (no looped sequence)
Additionally I think its better to control the filter via midi sequencer, as you have full control while working on your project.
Further the scope version has two different filterdesigns:
I wasn`t happy with the default cw filter, so I designed a filter myself that has a smoother sound and doesn`t have that annoying jump-breakpoint into loud self oscillation.
As an analog filter the afb-16 for sure has a very very smooth sound and its hard to reach this in digital domain at 44,1khz
At least I worked hard on my own filterdesign to get a "fresh sound" and "nice sound" that sounds good in all knob positions and is close to the real thing.
Here is a quick preview of the plug-in surface
Manual is inside the package.
you can use it to make fresh filterlines as the filter can go into self oscillation, but for sure you can also use the plug-in as a classic gate for cutting string and pad sounds into snippits that fit into tempo based music.
Even if you don`t touch the resonance you have an improved gate that can alter cutoff over time.
Especially good for trance stuff.

Finally some sound demos:
smooth filtering:
http://hifiboom.webhop.org/devices/msf- ... r_line.mp3
standard gate usage:
http://hifiboom.webhop.org/devices/msf- ... e_gate.mp3
raw arp freshed up with cutoff modulation and a bit self oscillation all done by the filter. the first seconds are the raw source sample, an arp 220hz fixed oscillator sample.
http://hifiboom.webhop.org/devices/msf- ... ltered.mp3
Finally I hope you enjoy.