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Wind Model

Using the CODM to create your own organ definitions, exchange CODM organ definitions, ...
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hackjo

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Wind Model

PostSat Nov 15, 2014 2:24 pm

If I wanted to create an instrument with a slight winding deficiency (trying to get the feel of a large instrument with slightly too little wind to supply full organ), what settings would be best to use for the following:

<WindModel_TotalResrvrAndWndchstVolMetresCubed>
<WindModel_AreaOfReservoirTableMetresSquared>
<WindModel_ResrvrBellowsPositiveDampingCoeff>
<WindModel_WindchestPressureDropPctAtMaxLoad> ?
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mdyde

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Re: Wind Model

PostSun Nov 16, 2014 6:36 am

The middle two settings mainly affect the rate, shape and magnitude of the 'wobbles' as pipes start and stop sounding, while the final setting mainly affects the wind drop (deficiency) when lots of pipes sound at once (full organ) and also the magnitude of the wobbles.

So you might want to set the first three settings first and then tweak the final setting to taste on full organ.
Best regards,
Martin.
Hauptwerk software designer/developer, Milan Digital Audio.

[Please use email or the Contact page if you need to contact us privately, rather than private forum messages.]

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hackjo

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Re: Wind Model

PostMon Nov 17, 2014 3:52 pm

Thanks Martin.

So would lower settings on the first two parameters make a wind chest more vulnerable to wobble?
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mdyde

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Re: Wind Model

PostTue Nov 18, 2014 6:33 am

Broadly speaking:

Lowering WindModel_AreaOfReservoirTableMetresSquared would mainly tend to give slower wobbles (since the CODM automatically calculates the amount of mass added so that the desired wind pressure is maintained at rest).

Lowering WindModel_ResrvrBellowsPositiveDampingCoeff would mainly tend to increase the amount of time for which the wobbles continued.

I'd suggest just trying it; set WindModel_TotalResrvrAndWndchstVolMetresCubed and WindModel_AreaOfReservoirTableMetresSquared very approximately to values that might be found in an organ of the type/size you're trying to model, then set WindModel_ResrvrBellowsPositiveDampingCoeff and WindModel_WindchestPressureDropPctAtMaxLoad to typical values, then load the organ and try it out (play large chords and rapid bass parts on large registrations and listen for the wobbles and wind 'sag'). Then give (only) one attribute higher/lower values, load it again and listen to the difference. Repeat for the other attributes to hear the effect that each of them has, then tune them to taste.

The CODM user's guide has fairly detailed descriptions of the general effects of each of the attributes, as well typical/suggested values for them (pages 41-42 in the current v4.1.0/1 version).
Best regards,
Martin.
Hauptwerk software designer/developer, Milan Digital Audio.

[Please use email or the Contact page if you need to contact us privately, rather than private forum messages.]

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