Vintage Synth Repair

What I did is to mess with the 2 pots for the filter adjustments
(cleerly labelled on the board - thanx, Yamaha! :)) and now it screams
alot! I came to the conclusion that most of my mods ideas might not be
able to accomplish but I still want to try as much as is possible. I
still wonder if I sould somehow put a switch btw. the OSC and VCF
signal path so that I can let the OSC's waveforms modulate the VCF.
Wonder how that might sound. Also I still would like to know where I
could put some patch points on that thing. A individual ADSR for the
VCA would be awesome too.  

--- In vintagesynthrepair@yahoogroups.com, "francois basquin"
<babouche369@...> wrote:
>
> Yes, interesting project, but I'm not sure CS01 is the best
candidate for 
> such a customization. I don't have the schematics, but I opened mine a 
> couple of times for cleanup and I think most of the electronics has
been 
> packed in a custom made chip.
> However, I'd be very curious to see how this micro-synth could be 
> customized.
> If I remember well, the model II is very close to the original (the
one I 
> have) except for the Resonance which is a slider instead of a
switch. Is the 
> filter capable to self-oscillate on this model ? And what is the
value for 
> this slider ?
> 
> François
> 
> 
> >From: "P........" <phd76er@...>
> >Reply-To: vintagesynthrepair@yahoogroups.com
> >To: vintagesynthrepair@yahoogroups.com
> >Subject: [vintagesynthrepair] Yamaha CS01II mods questions
> >Date: Sat, 28 Oct 2006 01:52:49 -0000
> >
> >I've got this olde yamaha cs01 which is functional but in a bad shape
> >- no case, just bare electronics. It's a wonder that this thing works
> >at all. I would like to make a new case for it and also seize the
> >opportunity to make some modifications on it but I need some advice on
> >what's possible to do and what not, so here's what I wanna do:
> >
> >- I want to replace the wave form selector with individual switches so
> >that I can mix multiple waveforms with each other (saw+tri+pulse and
> >such)
> >
> >- I also want to add another row of switches to individually select
> >waves to modulate the filter by osc.
> >
> >- I want to replace the switch for the mod wheel with individual
> >switches for vibrato and filter modulation and add another one so I
> >can modulate vca as well and one to bypass LFO modulation.
> >
> >- I would like to add ADSR controls for OSC and VCA and a switch for
> >each and VCF to bypass either of these.
> >
> >- I want to add controls to shape my own waveforms (kinda like on the
> >Roland sh3a.
> >
> >- a input for VCF and OSC would be cool, if that works at all (audio 2
> >OSC that is) and some patch points would be awesome so that I can do
> >stuff like syncing vcf to pwm and such.
> >
> >- Also I need to get the LFO to modulate much deeper and faster/slower.
> >
> >Lotsa plans, eh? Well let me know what can be done and some
> >examples/instructions for already accomplished mods would be veeery
> >helpful and time saving.
> >
> >
> >
> >
> 
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