[sdiy] Polyphonic issue revisited.

[Tim Johnson]

I'm beginning to get the picture.
Thanks for the reality check Jim.

Jim


>From: James Patchell <patchell at cox.net>
>To: "Tim Johnson" <ifixaudio at hotmail.com>,synth-diy at dropmix.xs4all.nl
>Subject: Re: [sdiy] Polyphonic issue revisited.
>Date: Fri, 12 Dec 2003 17:36:22 -0800
>
>Building a polyphonic DIY synth is a big job....but not imposible.  I built 
>a 4 voice one some 25 years ago...I used a Polymorphic 88 computer the 
>keyboard controller...but, that is another story....
>
>Your biggest engineering challenge is going to be the hardware.  20 years 
>ago, Curtis Electro Music and Solid State Music had chip sets to build 
>synthesizers...these greatly reduced the parts counts when building a poly. 
>  Those don't, for practical purposes, exist any longer, you we are stuck 
>with building our synths out of discrete components, so to speak.
>
>Another problem that you will have to solve is temperature stability of the 
>oscillators. Not exactly an easy job.  But it may force you to make a hard 
>choice between linear and exponential oscillators...(linear  and expo 
>oscillators both have their own unique problems to solve).
>
>It is a big job....one that so far, I have not had the guts to re-tackle 
>again...although, I am getting close... :-)
>
>At 08:12 AM 12/12/2003 -0500, Tim Johnson wrote:
>>Hi hate to bring this issue up again but I have been wondering about the 
>>possibility of building a poly synth. Just a couple of notes 8 or 10  you 
>>know. (Just kidding ==8-O).
>>Are any gurus familiar with the Korg Poly6? (I loved that board.) I worked 
>>on one a while back (I have a schematic for interested parties to peruse) 
>>and noticed that every time a key is played the led on the circuit board 
>>jumped from one of the 6 oscillators to the next.
>>... relatively feasable for a DIY or should I just buy one? Heaven forbid.
>>
>>(Donning rain gear for the tomatoes.)
>>
>>Jim
>>
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>
>         -Jim
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