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 Forum index » DIY Hardware and Software » Circuit Bending
Doepfer Ms-404 modding
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RogerGPan



Joined: Aug 12, 2011
Posts: 5
Location: Munich | Germany

PostPosted: Fri Aug 12, 2011 3:53 am    Post subject: Doepfer Ms-404 modding
Subject description: CV and internal Poti/Switch Mods for the 404
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I wanna mod my Ms404.

One of the things I wanna do is controlling the Mod-Depth of the 2 lfos (one for VCO, one for VCF) by an external CV.

I found a point to control the LFO frequency by CV (simply put the CV to the out pin of the LFO's frequ range switch), but how can I control the depth/amplitude of the LFO without using an extra VCA and without changing the 404's pcb?

http://imageshack.us/photo/my-images/43/ms404.gif/

Last edited by RogerGPan on Fri Aug 12, 2011 8:48 am; edited 2 times in total
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RogerGPan



Joined: Aug 12, 2011
Posts: 5
Location: Munich | Germany

PostPosted: Fri Aug 12, 2011 5:59 am    Post subject: Reply with quote  Mark this post and the followings unread

And heres the link to the whole service manual in german language.

The MS404 is great for modding, with quite a few jumpers and explicite mod points.

They suggest and explain a few mods in the manual.... like switchable LFO waveforms, Env to VCO pitch or PW, VCO sync, Ringmodulation with VCA in... and some others.

http://www.doepfer.de/ms404_sm.htm
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Infrablue



Joined: Dec 29, 2011
Posts: 122
Location: Utah

PostPosted: Mon Jan 30, 2012 1:41 am    Post subject: Reply with quote  Mark this post and the followings unread

Can you jumper set the 404 to output LFO through the CV out?
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RogerGPan



Joined: Aug 12, 2011
Posts: 5
Location: Munich | Germany

PostPosted: Mon Jan 30, 2012 4:37 am    Post subject: Reply with quote  Mark this post and the followings unread

no theres no jumper to set lfo out to CV. The CV out can only be set between In or Output.
But wiring the lfo out to a new output jack (or use the CV one) should be an easy job!
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Infrablue



Joined: Dec 29, 2011
Posts: 122
Location: Utah

PostPosted: Mon Jan 30, 2012 12:43 pm    Post subject: Reply with quote  Mark this post and the followings unread

cool... thanks for the reply!
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