MTurboFilter preset making action

[Held]

I just started working on something. I wanted to make something like an old ladder filter. You can load this up in MSF and try it out.

It sounds pretty good. Using a high-pass filter inside the feedback is a neat trick, although I don't quite understand how that works. Is there any reading material you can suggest on the topic?

To avoid some of the harmonics above the cutoff, you could add a volume module to reduce the output depending on the Q value. That way, the saturation doesn't get hit as hard and doesn't produce as many harmonics.

Code: Select all

2lpfast[hp6(200);sat] l(-18*q); sat(1;1); 

[Chandlerhimself]

I just started working on something. I wanted to make something like an old ladder filter. You can load this up in MSF and try it out.

It sounds pretty good. Using a high-pass filter inside the feedback is a neat trick, although I don't quite understand how that works. Is there any reading material you can suggest on the topic?

To avoid some of the harmonics above the cutoff, you could add a volume module to reduce the output depending on the Q value. That way, the saturation doesn't get hit as hard and doesn't produce as many harmonics.

Code: Select all

2lpfast[hp6(200);sat] l(-18*q); sat(1;1); 

Thanks for the tip, that actually helped. I read about the hp inside the feedback loop a while ago when I was looking up how the ladder filter works. I'm sorry I forgot the source. Anyway, it works to reduce the resonance with low frequencies which IMO sounds better(sometimes). I want to work more on this and control the hp filter frequency with the character knob for more variation.

[Held]

I'm watching this interesting talk about Filters and I'm trying to recreate it in MTurboFilter. The 4-pole ladder filter demonstration starts at 9:56

The resonance of the implementation in the video is super stable across all frequencies, whereas when I copy it in MTurboFilter, the resonance is much smaller at low frequencies.
This is the basic algorithm

Code: Select all

FB(-q; 0.00001)[4S[LP6(f)]]

(Is it possible to specify the delay of the FB module in samples as well?)

In the video he says that the feedback is multiplied by a little less than 4. Since MTurboFilter doesn't allow Feedback higher than one, I tried using an LC module to multiply the volume in the feedback path and then divide it afterwards.

!!!!Warning!!!!!
This is crazy loud even for small q values. Don't try this without a limiter

Code: Select all

FB(-q; 0.00001;;0)[4S[LP6(f)];lc(3.8)];lc(0.23)

Has anyone successfully recreated a Moog type filter in MTurboFilter? The 8-pole filter in the video sounds pretty great as well.

[Held]

In my quest to learn more about filters, I found this document which the talk in the video above was based on: https://www.native-instruments.com/file ... 2.0.0a.pdf
It suggests adding 1+q to the input to get a better response at low frequencies and it makes my filter sound a lot better already.

Code: Select all

LC(1+q);FB(-q; 0.000001+d*0.001)[4S[LP6(f)]]

A better solution seems to be a high-pass filter in the feedback path like this:

MTF_Ladder_Feedback.png

However, I don't think that's possible at the moment.

I really hope MTurboFilter comes with a nice ladder filter upon release for me to study

[Chandlerhimself]

In my quest to learn more about filters, I found this document which the talk in the video above was based on: https://www.native-instruments.com/file ... 2.0.0a.pdf
It suggests adding 1+q to the input to get a better response at low frequencies and it makes my filter sound a lot better already.

Code: Select all

LC(1+q);FB(-q; 0.000001+d*0.001)[4S[LP6(f)]]

A better solution seems to be a high-pass filter in the feedback path like this:
MTF_Ladder_Feedback.png
However, I don't think that's possible at the moment.

I really hope MTurboFilter comes with a nice ladder filter upon release for me to study

A highpass filter in the feedback loop is what I did in the preset above. You can put lots of things in the feedback loop of the filters, but I'm afraid of them blowing up. I also used the 12db filters instead of the 6db because the 12db are the fast filters. Since it isn't analog I don't think you need to use 6db filters, although I might make one using them just so I can get a 18db filter slope. I'm pretty sure I got the idea for the filter above from that schematic.

[Held]

In my quest to learn more about filters, I found this document which the talk in the video above was based on: https://www.native-instruments.com/file ... 2.0.0a.pdf
It suggests adding 1+q to the input to get a better response at low frequencies and it makes my filter sound a lot better already.

Code: Select all

LC(1+q);FB(-q; 0.000001+d*0.001)[4S[LP6(f)]]

A better solution seems to be a high-pass filter in the feedback path like this:
MTF_Ladder_Feedback.png
However, I don't think that's possible at the moment.

I really hope MTurboFilter comes with a nice ladder filter upon release for me to study

A highpass filter in the feedback loop is what I did in the preset above. You can put lots of things in the feedback loop of the filters, but I'm afraid of them blowing up. I also used the 12db filters instead of the 6db because the 12db are the fast filters. Since it isn't analog I don't think you need to use 6db filters, although I might make one using them just so I can get a 18db filter slope. I'm pretty sure I got the idea for the filter above from that schematic.

Yes, you can put something in the feedback path of individual filters, but you can't put it in the feedback path of the feedback module. At least I don't see away to recreate the architecture in the picture above.

I would imagine the available 24db filters already correct for volume changes and such, so there's no need to put a high-pass filter into their feedback path.

I don't know if there are significant audible differences between a ladder filter with the above architecture and the current 24db low pass filters, but I'd really like to figure out how to make a good sounding ladder filter MTurboFilter, even if its just for learning purposes.