Discussion about the Korg PolySix synthesizer

Hello all.

A few years ago i foud out that by cutting diode D1 on the synth board
(upper left corner) you can mix the sawtooth and pulse signals. the
diode cuts off the width of the pulse to zero when the vco is in
sawtooth mode. Removing the diode leaves the width intact so the two
signals are mixed.

be careful!

note that from then on, all previous memorized sounds sound different
than before because the pulse width in memory is not supressed anymore.

That should be easy enough to take care of.  Just put a switch inline with the diode!  Then you can switch it in and out easy...

----- Original Message -----
From: macsimski <simski@dds.nl>
To: PolySix@yahoogroups.com
Subject: [PolySix] simple vco hack for mixing sawtooth and pulse
Date: Sun, 02 Jan 2005 23:57:12 -0000

> 
> 
> 
> 
> Hello all.
> 
> A few years ago i foud out that by cutting diode D1 on the synth board
> (upper left corner) you can mix the sawtooth and pulse signals. the
> diode cuts off the width of the pulse to zero when the vco is in
> sawtooth mode. Removing the diode leaves the width intact so the two
> signals are mixed.
> 
> be careful!
> 
> note that from then on, all previous memorized sounds sound different
> than before because the pulse width in memory is not supressed anymore.
> 
> 
> 
> 
> 
> 
> 
> 
> PolySix "Digiest" Page: http://www.acc.umu.se/~amber/Poly6
> Yahoo! Groups Links
> 
> 
> 
> 



.sig
-Chromatest J. Pantsmaker
http://www.chromatest.net

Chromatest J. Pantsmaker wrote:
 >
 > That should be easy enough to take care of.  Just put a switch
 > inline with the diode!  Then you can switch it in and out easy...
 >

Even this is not necessary. You can leave out the diode completely
and program the "PW" control to a setting of "10", which gives the
same result (sawtooth only). This is not really spectacular. The
thing gets exciting when adding some amount of pulse wave.

This is part of the optional modifications along with my MIDI kit:
http://analog.no/polysix/index.htm

Johannes

> ----- Original Message -----
> From: macsimski <simski@dds.nl>
> To: PolySix@yahoogroups.com
> Subject: [PolySix] simple vco hack for mixing sawtooth and pulse
> Date: Sun, 02 Jan 2005 23:57:12 -0000
> 
> 
>>
>>
>>
>>Hello all.
>>
>>A few years ago i foud out that by cutting diode D1 on the synth board
>>(upper left corner) you can mix the sawtooth and pulse signals. the
>>diode cuts off the width of the pulse to zero when the vco is in
>>sawtooth mode. Removing the diode leaves the width intact so the two
>>signals are mixed.
>>
>>be careful!
>>
>>note that from then on, all previous memorized sounds sound different
>>than before because the pulse width in memory is not supressed anymore.
>>
>>
>>
>>
>>
>>
>>
>>
>>PolySix "Digiest" Page: http://www.acc.umu.se/~amber/Poly6
>>Yahoo! Groups Links
>>
>>
>>
>>
> 
> 
> 
> 
> .sig
> -Chromatest J. Pantsmaker
> http://www.chromatest.net
> 
> 
> 
> PolySix "Digiest" Page: http://www.acc.umu.se/~amber/Poly6 
> Yahoo! Groups Links
> 
> 
> 
>  
> 
> 
> 
>

On Tue, 04 Jan 2005 22:24:37 +0100, Johannes Hausensteiner wrote
> Even this is not necessary. You can leave out the diode completely
> and program the "PW" control to a setting of "10", which gives the
> same result (sawtooth only). This is not really spectacular. The
> thing gets exciting when adding some amount of pulse wave.

Yes, but leaving out the diode means that straight PW will always 
be "polluted" with the sawtooth, doesn't it? Without the diode how is any 
pure fixed length PW be possible? 

Anyway, it raises the question, is there a way to blend waveforms attenuated?

/Frank

On 7-jan-05, at 16:50, dko4342@vip.cybercity.dk wrote:

>
> On Tue, 04 Jan 2005 22:24:37 +0100, Johannes Hausensteiner wrote
>> Even this is not necessary. You can leave out the diode completely
>> and program the "PW" control to a setting of "10", which gives the
>> same result (sawtooth only). This is not really spectacular. The
>> thing gets exciting when adding some amount of pulse wave.
>
> Yes, but leaving out the diode means that straight PW will always
> be "polluted" with the sawtooth, doesn't it? Without the diode how is 
> any
> pure fixed length PW be possible?
>
>
no the other way round. when switching to sawtooth, blending in a pulse 
is also possible.