MBandpass (upgraded version): is a very slow sweep possible?

[XComposer]

Hello,

While I am filtering a long audio sample, I am looking for a way to make from it a very slow sweep (say, something like going from central frequency = 50 Hz to central frequency = 3000 Hz in 40 seconds and then back down in another 40 seconds) by using a very steep and narrow bandpass filter (capable to isolate from the existing audio sample one single harmonic at a time) and I need to do this not by drawing an automation curve on my sequencer track, but automatically with an LFO included in the filter.
As I was saying, the LFO must be slow.
I was wondering if this would be possible by using MBandpass, if I upgrade it from the free version to the paid version.
The fact that the LFO must be very slow is particularly important to me: is the LFO of MBandpass capable to produce such a slow sweep (in the upgraded paid version)?
If not, can you suggest another product to do so?

[DarkStar]

Try these settings in a Multiparameter (I used 4 seconds but 40 works too):



The only thing is you need to turn the switch On to sweep up then turn it Off to sweep down; there may well be a way to do that two-way sweep automatically within the plug-in.

[DarkStar]

^^^^
Found it: set this Transformation Shape:



and set the Switch Time to double the duration (80 seconds in your case).

Result:

[XComposer]

Thank you very much! You have been very kind and helpful, this forum is exceptional for the quality, speed and kindness of the answers. Thank you very much, really. Now I know that upgrading to the paid version would be the right thing to do for me.

[DarkStar]

You're welcome - but I've had another look - the Switch Time only goes up to 60 seconds, so your sweep can be a max of 30 seconds

[XComposer]

Ok, 30 seconds can be fine.
Sorry, can you please confirm that the above examples are made with the MBandpass plugin, not MFilter or another one? And that the filter bandwidth of this sweep that you made can be so narrow and steep that one can isolate a single harmonic at a time?
I'm asking this because I am seeing a parameter "Equalizer band - Frequency" in the picture, which I didn't realize was present in the MBandpass plugin under that name (I have only the free version, at present, so I cannot see all the features). I just want to be sure to buy the right plugin.

[DarkStar]

Oops- I made them with MEqualizer to show the effect visually. My apologies for the confusion.

It's a little different using MBandPass but here it is. I used MNoiseGenerator to create some white noise, MBandPass to do the sweep and MAnalyzer to display the result.

2MB animated gif: http://i.imgur.com/tPamiYC.gif

And here are the MultiParameter settings (you will see that both Filter Frequencies are mapped to the one Multiparameter):



I'm not sure that you will be able to get to the extreme filtering. Please try it out with the demo version to see if it can do what you are looking for.

[DarkStar]

But ... you get both MBandPass AND Mequalizer in the "FreeEffectsBundle" (along with loads of others) so try out both.

And you only pay the €49 once to license / authorise them all. The main functionality is the same in the licensed versions; the differences are:

• You can change size and style of the plugins.
• You can access sonogram feature in analyzers and equalizers.
• You can manipulate your own presets.
• Most plugins can perform upsampling which minimizes aliasing, therefore it is useful to improve sound quality.
• The plugins will not contain the big box in the bottom with our clickable logo.
• You will make us happy and let us develop more free software .

[XComposer]

Yes, MBandpass can do extremely narrow filtering: to do this, you just choose the maximum slope for each of the two filters and select a very small difference in frequency between them. I can do it on the free version. Modulation parameters and multiparameters, on the contrary, cannot be changed in the free version (only the factory presets are active) so I cannot check how to do the sweep until I buy the bundle, and that's why I asked how to do it. Thank you very much again!

[DarkStar]

Ah ha - I did not know (or had forgotten ) that Modulation parameters and Multiparameters cannot be changed in the free version. Maybe that is what "You can manipulate your own presets" means.

OK, so in the free version you can select the narrow band and my screenshots show how to use the MultiParameters, so you should be good to go.

When I tried some very steep filtering the sweep caused my track to auto-mute (level > +6dB) so tread carefully.

[ZentralmassivSound]

You can also use a modulator for that (if MBandpass has those), configure 1/80 second as LFO frequency, enable one shot and MIDI reset. That should do it as well, and you can go faaaaar slower.

[XComposer]

Interesting! Thank you. And you go in both the directions (up and then down and then up again, and so on)?

[ZentralmassivSound]

Yes, you can draw your complete own shapes literally without any limitations. That's for sure one of the strongest parts of Melda plugs, the LFOs. There isn't anything they can't do, hehe.

It's easiest to use the step sequencer to draw an up/down sweep. 0.0125 sec are 1/80 sec so the sweep lasts 80 secs.
edit: actually you can just use a regular triangle shape with 90° phase shift

[XComposer]

I decided to upgrade the Free Bundle and, after doing that, I tried immediately to do what is described in this discussion.
No problems with M Bandpass (method described by the last image hereabove in this discussion): it works perfectly (and that's enough for me, by the way, I'm very happy with that).
On the contrary, when I tried with M Equalizer (described by the first three images hereabove in this discussion) I met a problem: I am obtaining only a single sweep. M Equalizer performs a single sweep once, then stops, without going on sweeping to and fro, that was my purpose. I have not understood yet what I am doing wrong… probably it really must be like that and nothing is wrong.