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segunda-feira, 4 de dezembro de 2017

G1&G2 - Multiband Reverbs!

Do you remember my "Improving Your Reverbs" post?
This is kinda of a follow up!

However, it is not as nice of a post as I'd hope it to be, because if you start adding reverb modules for different bands, you'll notice the resources available in the Clavia Nord Modular G2 will be spent very fast...

And as an example of that is this patch, which was my first try to produce a multiband reverb!

Unfortunately, it was not possible to add any more modules to this patch, as it maximizes the patch load cycles at 99.3% (memory was much lower, at 75.6%, no matter what size you choose for all 3 reverb modules)

This means, if you want a 3 band reverb in a single patch, it will have to be very simple, or you just want have enough resources available to run your patch...

The good thing is, despite this is a pretty simple patch, it can sound pretty good!

If there were more resources, the first thing I'd do would be to consider low pass filters with more than 18db of slope, since that would provide more defined bands.

In case it wasn't clear to you how the band separation is achieved, I would recommend you to check the amazing Rob Hordijk G2 Tutorial!

You should have a look at everything in that tutorial, if you have the time, but the main idea is that, if you use one of those mixers that allow you to invert your signal, you can obtain an high pass filter using a low pass one.

So, what I did with "Mix1" was to obtain the signal that is "rejected" by the "FrqLow" low pass filter.
To this signal is then applied another low pass filter, "FrqHigh", which allows us to obtain the top band using "Mix2".
Of course, you should set the frequency of "FrqHigh" to be higher than the one for "FrqLow", or else you'll end up with only 2 bands rather than 3!

With the signal split in 3, all I had to do was send it to 3 different reverb modules, in order to obtain a 3 band reverb as I wanted, which is then mixed with the dry signal before sent to the outputs!

I felt this kind of patch can give really nice results, especially when you consider low reverb times for the low frequencies, but a high reverb time for the higher ones!

If you are searching for a nice way to achieve a nice ambience in your tracks, that's a good way to go! ;)

If you feel 2 bands are a better choice, you can do considerably more in a single patch, but you'll still find yourself wanting to add some more modules...

This was my try at a 2 band reverb, and it only consumes 89.5% of the patch load cycles available!

As you can see, in this patch I was able to add a low pass filter with 36db slope to get a better defined band separation.

But not only that, as I was also able to add a compressor for each band, a noise gate applied to each of the inputs (which can be very useful if you have, for instance, an Elektron SIDstation, or any other noisier machine) and even a noise gate after the reverb mix so that gated reverbs are possible!

This patch ends up being much lighter than the one presented before, as there were still around 10% of processing power available, but unfortunately, there wasn't much that could be added to this patch before using more processing power than what is available...

One of the obvious things to add to this patch would be a pre-delay, but to add 4 delays and 4 mixers, so that there could be a pre-delay dry/wet mix parameter, means something would have to go.

In this case, I chose to give up on the 4 noise gate modules included, which led me to the following patch, consuming 95.5% of the patch load cycles available!

As you probably noticed, there is independent control of the pre-delay for both channels (and for both bands).
Personally, I would have liked to control the time of the delays for both channels simultaneously (like a true stereo effect), but using a constant to modulate the time of the delays would have used more resources than available, so I ended up giving the pre-delay times independent control (which can be nice as well, especially if you detune those times slightly, as I did in the picture above).

Despite a 2 band reverb allows for more interesting processing of each band, you still can't build a fairly complex reverb structure...

The best way for doing that is to consider several patches running together, each of them providing reverb to a single band of the input signal and mixed together in one of the patches, using the 4 bus channels available.

Using stereo processing, that means it should be possible to produce quite complex 3 band reverb patches with the Clavia Nord Modular G2!

However, this post is not dedicated to reverbs that are "spread" between several patches, which is a topic for a follow up post that I intend to come up with soon!

As a final remark for this post, while splitting your sound in several bands can lead to very interesting effects (and I dare you to try this yourself!), it might not always be the way to go if you want very complex reverbs!

At best, you should be able to get a patch as complex as the one presented in "Improving Your Reverbs", but processing each of your 3 bands (using the 4 bus channels available).

But I won't say more now, as I'm feeling it will be very worth making a proper post dedicated to reverbs that are "spread" between several patches!

So, if you found this post to be interesting, be sure to follow my blog, as there will be more interesting posts coming up! ;)

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