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 Forum index » Clavia Nord Modular » G2 Patches - Completed » Acoustic
Reaktor/Steampipe take II
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Robby



Joined: Feb 08, 2005
Posts: 39
Location: SF, CA, USA
Audio files: 1
G2 patch files: 6

PostPosted: Sun Feb 13, 2005 5:52 pm    Post subject: Reaktor/Steampipe take II Reply with quote  Mark this post and the followings unread

NO OSCILLATORS ARE USED IN THIS PATCH.
(only a noise source w filters & a feedback loop.)

After reading Chet Singer's physical modeling tutorial,
I made some changes to the modeling patch:
The Rezonator is done with an allpass filter instead of a string oscilator.
The overdrive is in the feedback path.
There's an extra highpass filter in the push-pull stage.

This is a very flexible physical modeling patch,
& it only uses about 33% of the patch capacity.

Variations:
1. a plucked string that feeds back if you hold it down for awhile
2. a mellow flute patch
3. basic violin
4. clarinet
5. overblown flute chiff
6. hollow feedback sound w 3rd harmonic emphasized
7. muted horn?
8. Brighter viola sound


Notch Steam.pch2
 Description:
Another physical modeling patch based on Reaktor/Steampipe

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 Filename:  Notch Steam.pch2
 Filesize:  3.15 KB
 Downloaded:  1612 Time(s)

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Robby



Joined: Feb 08, 2005
Posts: 39
Location: SF, CA, USA
Audio files: 1
G2 patch files: 6

PostPosted: Wed Feb 16, 2005 6:40 pm    Post subject: Reply with quote  Mark this post and the followings unread

BTW - if you've downloaded this patch & want to make new variations ...

I've set this up so that all the parameters that should be tweakable
are in the G2 parameter interface, and all the ones that should
be left alone are absent.

Either work from the G2 interface without the computer initially,
or if you prefer the editor, pull up the parameter overview page
to see what is intended to be tweaked.

Programming with feedback loops is hard.
It's also hard to get a pleasant sound out of a violin
or any sound at all out of a shakuhachi.

If you come up with good stuff, I'd love to hear it.
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ian-s



Joined: Apr 01, 2004
Posts: 2574
Location: Auckland, New Zealand
Audio files: 42
G2 patch files: 608

PostPosted: Wed Feb 16, 2005 7:38 pm    Post subject: Reply with quote  Mark this post and the followings unread

This is a great patch. I don't know how it works but it makes some very nice sounds, without using a lot of dsp.
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zynthetix



Joined: Jun 12, 2003
Posts: 838
Location: nyc
Audio files: 10
G2 patch files: 13

PostPosted: Wed Feb 16, 2005 8:07 pm    Post subject: Reply with quote  Mark this post and the followings unread

The sounds on this are beautiful. The entire character of the clarinet (var. 4) changes drastically in a great way when the KB hold or sustain is used. (well, it sounds great on a unexpanded G2 with 4 voices anyway)
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Robby



Joined: Feb 08, 2005
Posts: 39
Location: SF, CA, USA
Audio files: 1
G2 patch files: 6

PostPosted: Wed Feb 16, 2005 8:30 pm    Post subject: Reply with quote  Mark this post and the followings unread

Some basics on how this patch works -

the idea behind this & most physical modeling patches is that
you start with an impulse & run it thru a resonator.

If you're a guitar player the impulse is the pick
and the resonator is the string.

If you're playing a steam organ, the impulse is steam
& the resonator is the pipe - hence "steampipe".

The initial impulse ("steam") in this patch is the noise generator run thru a low-pass filter and an envelope. You use these to shape the character of the initial impulse. A picked instrument would be a quick short burst while a bow would be slower & have more sustain. The steam mix adds the DC "voltage" of the envelope to the noise - hard left is all noise, hard right is all DC. This is enough to approximate many types of impulses.

The rezonator ("pipe") is a delay with a feedback loop. The rezonator envelope (RezEnv) controls how the resonance of the pipe changes over time - a guitar player can mute his strings, for example. The resonance is determined by a base level (Rez Min) plus the scaled Rez Env. Some instruments have little or no change in their resonance characteristics over time, other have lots. These values are basically the feedback level of the delay line. The "Rez Drive" also has a large influence on the "pipe".

The "polarity" button maps nicely to conventional synths - "plus" polarity is a sawtooth wave & "minus" is a square wave. "Plus" has more of the characteristics of a string or horn, while "minus" has more of the characteristics of a pipe or flute.

The "push-pull" section controls how the feedback on the delay line interacts with the impulse energy - for a violin, it's how the wave on the string reinforces or interferes with the energy from the bow to create a tone. The "pull" is another way to add a DC offset, & it can interact in interesting ways with any DC offset from the steam mix.

What's both fascinating & frustrating about this is that it doesn't work the way a typical analog synth does - i.e. turn some knob a little & it gets louder/brighter/... so turn the same knob further & it does the same only more so. It's got more the character of everything affecting everything else in a non-linear fashion.
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