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 Forum index » DIY Hardware and Software » fonik's place
8-Step Sequencer with voltage controllable pattern (VCPS)
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blue hell
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Joined: Apr 03, 2004
Posts: 24396
Location: The Netherlands, Enschede
Audio files: 296
G2 patch files: 320

PostPosted: Sat Apr 27, 2019 8:42 am    Post subject: Reply with quote  Mark this post and the followings unread

Oh yes, plenty of control stuff to be done for emebedded computer thingies. And I'll push noone anywhere Laughing
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Jan
also .. could someone please turn down the thermostat a bit.
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blue hell
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Joined: Apr 03, 2004
Posts: 24396
Location: The Netherlands, Enschede
Audio files: 296
G2 patch files: 320

PostPosted: Sat Apr 27, 2019 3:17 pm    Post subject: Reply with quote  Mark this post and the followings unread

Fiddled a bit with it .. and came to the conclusion that 16 steps can work alright provided that the gain and offset controls for the VC input work exponentially.

That way you only need as many steps as there are steps in the sequencer .. and you can then set the offset to the step the effect should start on and the gain to the range of steps it should work on.

In code this is easy to do, in pseudo code something like:

Code:

uintX_t function GrayCode( uintX_t aValue)
{
  return aValue ^ ( aValue >> 1);
}

Pattern = pattern_input / voltage_range;
Start = 1 << ( stepcount * offset_input / voltage_range);
Length = 1 << (stepcount * gain_input / voltage_range);
Pattern = GrayCode( Start + Length * Pattern); 


still for your setup you would need a 16 bit ADC for 16 steps .. that's not a very handy thing to need in a mixed analog / digital setup .. even when using a processor as most processors will only have 10 or 12 bit ADCs built in.

But it still could be useful for a shorter sequencer too, to make it easier for the user to set the effect range.

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Jan
also .. could someone please turn down the thermostat a bit.
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blue hell
Site Admin


Joined: Apr 03, 2004
Posts: 24396
Location: The Netherlands, Enschede
Audio files: 296
G2 patch files: 320

PostPosted: Sat Apr 27, 2019 3:23 pm    Post subject: Reply with quote  Mark this post and the followings unread

Oh and also - it is a very nice sequencer! Cool
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Jan
also .. could someone please turn down the thermostat a bit.
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sticks & gongs



Joined: Sep 21, 2024
Posts: 9
Location: Berlin

PostPosted: Wed Nov 13, 2024 4:35 pm    Post subject: Reply with quote  Mark this post and the followings unread

Hi folks
Almost done with the wiring of this long neglected project...
I realized now there are two CV outputs available....??
What's the difference between the "processed CV out" from W1 and the attenuated "CV out" from J2??


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The Peasant



Joined: Nov 13, 2009
Posts: 107
Location: Sunny Alberta
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PostPosted: Mon Nov 18, 2024 9:13 pm    Post subject: Reply with quote  Mark this post and the followings unread

The processed CV out is just the input CV combined with the offset and fine controls. The CV out from J2 is the actual sequencer CV output from each step.

Take care,
Doug

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sticks & gongs



Joined: Sep 21, 2024
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PostPosted: Tue Nov 19, 2024 8:00 am    Post subject: Reply with quote  Mark this post and the followings unread

Thanks for the explanation
Is nice to be back here
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Skrog Productions



Joined: Jan 07, 2009
Posts: 1215
Location: Scottish Borders
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PostPosted: Tue Nov 19, 2024 10:35 am    Post subject: Reply with quote  Mark this post and the followings unread

nice build on the sequencer Smile
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sticks & gongs



Joined: Sep 21, 2024
Posts: 9
Location: Berlin

PostPosted: Tue Nov 19, 2024 11:08 am    Post subject: Reply with quote  Mark this post and the followings unread

Thanks...trying to put together a basic buchla system....this sequencer seemed a bit tight for a eurorack...better would be if it even start to work correctly
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sticks & gongs



Joined: Sep 21, 2024
Posts: 9
Location: Berlin

PostPosted: Tue Nov 19, 2024 11:10 am    Post subject:   Reply with quote  Mark this post and the followings unread

The Peasant wrote:
The processed CV out is just the input CV combined with the offset and fine controls. The CV out from J2 is the actual sequencer CV output from each step.

Take care,
Doug

Thanks a lot
God assist me to make it work
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