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 Forum index » Clavia Nord Modular » G2 Building Blocks
variable slope ramp lfo
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ian-s



Joined: Apr 01, 2004
Posts: 2585
Location: Auckland, New Zealand
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PostPosted: Sun Mar 06, 2005 1:05 am    Post subject: variable slope ramp lfo Reply with quote  Mark this post and the followings unread

This is based largely on work posted by IK. It is a low frequency version of his saw oscillator with added control of ramp direction. A single signed knob or CV controls both the rate and direction of the ramp, Negative values give increasing frequency downward ramps while positive values give increasing frequency upward ramps, zero stops oscillation. It is functionally the same as a LfoShpA set to a ramp with a value controlling the direction input, the most significant difference apart from a modest saving in dsp, is the reset is nice and sharp. The sluggish ramp reset on the LfoShpA renders it useless for some applications, like feeding the SeqCtr for example.


upDnLFOctrl.pch2
 Description:
var rate and slope lfo

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Blue Hell
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Joined: Apr 03, 2004
Posts: 20736
Location: The Netherlands, Enschede
Audio files: 158
G2 patch files: 318

PostPosted: Sun Mar 06, 2005 9:28 am    Post subject: Reply with quote  Mark this post and the followings unread

Ah, a decent reset, just what the doctor ordered :-)

Jan.
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jamos



Joined: Jun 01, 2004
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PostPosted: Sun Mar 06, 2005 11:07 am    Post subject: Reply with quote  Mark this post and the followings unread

Thanks a million for this.

Ironically, before I posted my Shepard tone patch yesterday, I almost posted a request for something like this... because such an LFO will allow the tone to move up, down, or stop., w/o changing timbre

Back to the drawing board!
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jamos



Joined: Jun 01, 2004
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Location: Eugene, Oregon, USA
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PostPosted: Tue Mar 08, 2005 6:40 pm    Post subject: Reply with quote  Mark this post and the followings unread

Thanks again for this - it's helping me do something that I think will be really cool.

but I think there's an error, or at least a sub-optimal setting, in the block: the low reset level should be -64, not 0, in order to get a full bipolar swing.. yes?

Works better for me that way, anyway.
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ian-s



Joined: Apr 01, 2004
Posts: 2585
Location: Auckland, New Zealand
Audio files: 42
G2 patch files: 612

PostPosted: Tue Mar 08, 2005 8:10 pm    Post subject: Reply with quote  Mark this post and the followings unread

jamos wrote:
the low reset level should be -64, not 0, in order to get a full bipolar swing.. yes?


Yes, I must have fooled with it and not put it back Embarassed.

Being able to modulate the upper and lower limits is quite nice.
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