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Beside what David said - yes, someone did it already: http://www.cs80.com/SSK/ Ok, it is not for the polyphonic series, but it shows, that is doable, and also that it would provide other advantages,

Jonathan, Duplicating the logic is easy. The big pain is the voltage. The Yamaha uses 4000-series CMOS and runs all the digital logic at +8.5 / -6.5 -> 15 volt supply. It’s offset above/below

Has anyone ever looked into modern alternatives for these fragile and rare 40-year old chips? I am wondering if it'd be possible to program an Arduino to handle key coding/assigning and D/A conversion

I checked the voltages at the 4051 key input pins (13-15, 1, 2, and 5), and they do not look reasonable. Whilst healthy keys on other 4051's rest at 6V and approach 13-14V as you apply aftertouch, the

Hi David, Thanks for the info and happy new year to you as well! This is actually the second time you've helped me, as I've been going by the CS-80 schematics and block diagrams from your website -

Hi Jonathan! Happy New Year and sorry about your CS80 problem. It sounds like you’re doing a good job trying to isolate the problem. However, I don’t know if you can do this with just a

Hello, I am looking for technical help for a Yamaha CS-80. The issue it is having is: a cluster of six notes (G2 to C3) generate full volume at all times when keyed, no matter how softly they are

Thanks guys! Sorry about the mess! I don't use Yahoo Groups in a long time! Bests, 2017-12-01 6:34 GMT-02:00 Florian Anwander fanwander@... [yamahacs80] <yamahacs80@...>:

Jonathan sent this mail to my mail-account directly. I answered him the following: -----------snip----------- Hello Jonathan I am not the moderator, but your posting appeared on the groups list. So

Hello Jonathan I am not the moderator, but your posting appeared on the groups list. So appearently are subscribed and the address jw_dewdney@... is the valid address. The last postings were

Hi Florian - I think you are the moderator of the CS80 group? Do you know anything about changes to Yahoo's programming that has been causing problems? I do not seem to be able to access the CS80

Thanks, Florian! Glad you like my band :) Yeah... I have the tech guy, but it's the only one and he is... fully booked. I'll have to wait and he is not fast (he took 4 years to "repair" part of

Hello Murilo, It is cruel to say, but I think owning a CS80 without having a competent tech within reach does not make real sense. When you say, that you had it repaired already, while you owned it,

My name is Murilo from Brazil and I have a Yamaha CS80 for around 7 years. In those 7 years it’s been through repair and now I have no sound out of it. The CS80 powers normally, but no sound… Only

Thank you so much!! I found the toggle switch and flipped it other direction, and sure enough the LFO > VCO slider now affects the sound! :)? Thankfully no fix is required... now to keep my eyes on

There should be a push button and a toggle switch. The instructions say to add them on the front panel below the tuning

Thanks for the reply... do you mean the MIDI kit adds a toggle switch for LFO > VCO modulation? If so, where would I find that switch to change it back? The seller showed me an emergency switch for

Hello Sounds like a voice getting out of tune. Might be a bad trimmer, but more likely a VCO chip dying. I recommend to add a LED to each voicecard, with which you can detect, which voice is used:

This is normal. With the added toggle switch one way, the slider works normally. With it the other way, the LFO -> VCO is control via MIDI mod wheel.

Hi all, I have a Yamaha CS-60 I recently acquired from a local seller that has MIDI kit installed. 1. Upon testing I noticed the sub oscillator LFO > VCO slider does not work/effect the sound