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 Forum index » DIY Hardware and Software
portamento question
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isak



Joined: Dec 13, 2009
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PostPosted: Wed May 22, 2013 11:22 pm    Post subject: portamento question Reply with quote  Mark this post and the followings unread

Hi guys.

i want to build a portamento for one vco but there are 2 types of portamento.
the first type is auto, if i press c1 and release the key and then press c2 it will auto glide.
the second type is... if i press c1 keep on pressing and press c2 only then it will glide.

like in the sh101..

Posted Image, might have been reduced in size. Click Image to view fullscreen.

i need the second type, i just dont know how to look it up or how you call it in english Embarassed

any scheme of the second type will be much appreciated.

i thank you in advance,
Isak E.

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roglok



Joined: Aug 28, 2010
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PostPosted: Thu May 23, 2013 2:16 am    Post subject: Reply with quote  Mark this post and the followings unread

The YuSynth slew limiter is simple enough and should do what you are looking for http://yusynth.net/Modular/EN/DUALSLEW/index.html
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isak



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PostPosted: Thu May 23, 2013 6:17 am    Post subject: Reply with quote  Mark this post and the followings unread

Thank you.

So from what I read it's working only when it gets the gate?

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ian-s



Joined: Apr 01, 2004
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PostPosted: Thu May 23, 2013 7:50 pm    Post subject: Reply with quote  Mark this post and the followings unread

Yes but you want a way of generating a gate only for legato or overlapping notes. What are you using for a keyboard?
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isak



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PostPosted: Thu May 23, 2013 10:21 pm    Post subject: Reply with quote  Mark this post and the followings unread

ian-s wrote:
Yes but you want a way of generating a gate only for legato or overlapping notes. What are you using for a keyboard?

you right but if i want to do that i'll just not connect to the gate input.
i'm using midi keyboads with midi to cv.

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ian-s



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PostPosted: Fri May 24, 2013 1:05 am    Post subject: Reply with quote  Mark this post and the followings unread

This midi to CV looks like it has exactly what you want.

isak wrote:
ian-s wrote:
Yes but you want a way of generating a gate only for legato or overlapping notes. What are you using for a keyboard?

you right but if i want to do that i'll just not connect to the gate input.
i'm using midi keyboads with midi to cv.
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isak



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PostPosted: Fri May 24, 2013 2:46 am    Post subject: Reply with quote  Mark this post and the followings unread

Thank for the link.

I'm using this one...
http://www.acxsynth.com/midi2cvlite/midi2cvlitefr.htm
Do you think it will be good?

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isak



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PostPosted: Fri May 24, 2013 7:47 am    Post subject: Reply with quote  Mark this post and the followings unread

Actually I think the chain is midi to cv to yusynth module and from there to the vco.
So what's the deference between the Kenton mid to cv, isnt its the same going on inside the Kenton?

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ian-s



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PostPosted: Sat Jun 22, 2013 2:27 pm    Post subject: Reply with quote  Mark this post and the followings unread

Sorry I missed your last post. The Kenton software is written to detect overlapping notes and enable glide only for those.

In the olden days, overlapped notes could be detected using the keyboard resister ladder at both ends (like for duo phonic circuits from Odysey and Cat)

You might be able mod the code on your device to produce a glide control gate when you get a second "note on" before the "note off" of the previous key arrives.

Without this extra gate signal, you are only going to get full time glide or no glide.
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isak



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PostPosted: Sat Jun 22, 2013 2:31 pm    Post subject: Reply with quote  Mark this post and the followings unread

Thanks for the input.
I'm way far to modified the code.

I'll give yusynth a try, already etched and built it but didnt tried it yet.

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