Hi Kent,
thanks for the explenation. 64 vca-ic's, that's a lot of rare ic's.
I thought you would generate the extra lfo's digitally ;-)
Personally, I don't need the seperate lfo-mod. However, I find it
difficult to program nice string-sounds on the CS80. I don't even
come close to the strings of an prophet, jupiter or OB-8 etc.
There's allways too much or too little PWM. It just sounds to much
modulated and not as a rich stringsound. I don't know why, is it the
filter ? I guess (!) that having the PWM lfo phase-shifted for each
voice seperatly could give nice results, maybe a simple circuit
would do the trick ? Why would we need to have the PWM on all voices
phase-synced, I don't anyway ?
Can you explain the unison-mod a little ? Can you choose 2-,4- and 8-
voice ? Can you play a 2-unison 4-voice polyphonic etc etc ?
We would love to know what kind of mods can be done by you, maybe
some of us are interested in your modifications and have them let
done by you (as soon as you have your garden cleaned up).
Do you have the CS80's re-tolexed by yourself or is someone else
specialised in this ? I think it's a hell of a job, isn't it ?
I suspect you have a crane to lift the complete circuits out of the
case in one piece to give you room to retolex ;-)
Please go on restoring and fixing these great machines !
Erik
--- In
yamahacs80@yahoogroups.com, "kent spong" <kent_spong@...>
wrote:
>
> Hi Erik,
>
> Yes that's right. The 16 IG00150 VCO's are for the VCO, VCF and
VCA of the
> LFO section and are also controlled by the after touch too. The
only down
> side to this mod is the 64 IG00151 VCA IC's it uses. The whole
thing is
> switched in and out on the LFO EXT point on the waveshape slider
and also
> swiches out on the EXT Modulation socket on the back. So there is
no change
> to the front panel of the 80 at all. However, I am working on a
totally
> faithfull replacment front panel for the 80 to restore one's that
have seen
> to much damage over the years. I want to keep these fantastic
machines going
> for as long as I can.
>
>
>