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BUCHLA 291e / new AMPLITUDE feature
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funkyfarm



Joined: Jan 21, 2007
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PostPosted: Sat Dec 06, 2008 7:27 am    Post subject: BUCHLA 291e / new AMPLITUDE feature Reply with quote  Mark this post and the followings unread

Quote:
The 291e Triple Morphing Filter consists of three voltage controlled filters operating independently or in parallel.

The amplitude, center frequency, and bandwidth of each filter may be independently voltage controlled. Each may be modulated with externally applied signals.



Hi,

is anyone have a clue to understand how this new AMPLITUDE feature is implemented ?

VCA on signal input ?
VCA on signal output ?
vactrol vca style (292) ?

Is it here to lower input signal when RESO/BW settings start to get dangerous ?

Cheers,

ff

http://www.buchla.com/images/modules/200e_291e.jpg
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cbm



Joined: Oct 25, 2005
Posts: 381
Location: San Francisco

PostPosted: Sat Dec 06, 2008 11:11 am    Post subject: Reply with quote  Mark this post and the followings unread

I believe it's a vactrol on the output. It only effects the mix out (not the individual filter outs), so it can't be on the input of the filter.
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funkyfarm



Joined: Jan 21, 2007
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PostPosted: Sun Dec 07, 2008 9:07 am    Post subject:
Subject description: Crosstalk: Don Buchla replies...
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SOS quotes :
Quote:
As its name suggests, the 291e contains three digitally controlled analogue band-pass filters, with control over centre frequency, amplitude and bandwidth, the last two of which imitate the resonance of traditional band-pass filters, but without self-oscillation





Since yesterday, I was about to think Don's AMPLITUDE to be what Scott Stites called Resonance.

http://mypeoplepc.com/members/scottnoanh/sitebuildercontent/sitebuilderfiles/291%20.jpg

Cool


However, Don had a lot of (nasty) things to tell about this article... Laughing
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funkyfarm



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PostPosted: Sun Dec 07, 2008 10:09 am    Post subject: Reply with quote  Mark this post and the followings unread

I am such an ignorant.

I had to wander around Music Easel and youtube to realise that 259's TIMBRE is (also surely) through zero FM.

Quote:
The complex osc triangle wave is amplitude modulated by the mod osc, then the timbre control (through zero FM) on the complex osc is raised around the 7 sec mark. At about 20 secs the switch is flipped to change from AM to FM on the mod osc., varying the frequency until it's back to triangle, then sine.


http://www.youtube.com/watch?v=c6NVkxLX6Gs&NR=1
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cbm



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PostPosted: Sun Dec 07, 2008 10:52 am    Post subject:
Subject description: Crosstalk: Don Buchla replies...
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[quote="funkyfarm"]SOS quotes :
Quote:
As its name suggests, the 291e contains three digitally controlled analogue band-pass filters, with control over centre frequency, amplitude and bandwidth, the last two of which imitate the resonance of traditional band-pass filters, but without self-oscillation

SOS is wrong here. It really is just amplitude of the filter into the mix. It allows you to set the level of each filter, for each step of the mini-marf.

Quote:
I had to wander around Music Easel and youtube to realise that 259's TIMBRE is (also surely) through zero FM.

It's not FM. It's in the general class of non-linear transform that some call a wave folder. The Timbre section of the Music Easel, the 259 and the 261e are all fairly similar.

The Serge Wave Multiplier is another example of a wave folder.

- C

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funkyfarm



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PostPosted: Mon Dec 08, 2008 12:27 pm    Post subject: Reply with quote  Mark this post and the followings unread

I am such ignorant. Very Happy

Thank you for these real precious infos.

Now I guess that Cynthia's Zeroscillator is in no way a 259 style sound generator ? (i think i've read that somewhere online Cool )

I'd better stop googling.

Cheers,

ff
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cbm



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PostPosted: Mon Dec 08, 2008 12:51 pm    Post subject: Reply with quote  Mark this post and the followings unread

funkyfarm wrote:
Now I guess that Cynthia's Zeroscillator is in no way a 259 style sound generator ?

No, the Zeroscillator is not that similar to the 259. The Zeroscillator specializes in FM, which is great for what it is; I have one on order.

The 259, with it's Timbre section, is in its own world, much of which it shares with the current 261e, and to some extent with the Music Easel.

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funkyfarm



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PostPosted: Fri Dec 12, 2008 3:25 pm    Post subject: Reply with quote  Mark this post and the followings unread

Many thanks for your precisions and for sharing experience.

Cheers,

ff
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