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 Forum index » DIY Hardware and Software
Step sequencer portamento...
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comrade_zero



Joined: Mar 05, 2009
Posts: 50
Location: arizona
Audio files: 4

PostPosted: Fri Oct 05, 2012 12:16 am    Post subject: Step sequencer portamento...
Subject description: on a per-step basis...
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So, it seems right now a lot of people are building sequencers... and that is GREAT! I'm currently working on a 16-step (selectable 1-16), multimode (fwd, bkwd, bounce, random) sequencer based on the cd4028 binary-to-decimal counters driven by an arduino microcontroller. So far so good there. The basics are working as they should... but I would like to add a portamento effect and make it selectable per step. Does anyone have a really good portamento circuit they would care to share?
The one I am currently testing with doesn't really cut it for me... and now for the kicker, making it selectable per step. I've been trying to switch the two signals (dry CV and portamento CV) using a cd4051, but I have not been particularly successful at this point...
Any thoughts on the matter? I'd love to hear ideas...
Thanks, e-m community!
c_z
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JingleJoe



Joined: Nov 10, 2011
Posts: 878
Location: Lancashire, England
Audio files: 14

PostPosted: Fri Oct 05, 2012 12:57 am    Post subject: Reply with quote  Mark this post and the followings unread

I have used a simple passive low pass filter for portamento; a 1meg pot in series with a 4k7 resistor and a 47nf cap (if I remember rightly).
To switch it in and out for each step I would do something like you suggested, with a 4051 or maybe a 4066 or maybe combined with ordinary switches; but I'm thinking I would probably have two control voltage lines- one for portamento and one for the straight CV, so you can merely switch CV signals for each step. Yeah that would work, I'll do a circuit diagram if you don't get it.

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corex



Joined: Mar 02, 2010
Posts: 112
Location: Las Vegas

PostPosted: Fri Oct 05, 2012 11:51 am    Post subject: Reply with quote  Mark this post and the followings unread

The YuSynth dual gated slew might suit you: http://yusynth.net/Modular/EN/DUALSLEW/index.html
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