MOTM

You are correct in your understanding of what through zero means.
It is my understanding that through zero modulation can be achieved with
a triangle core VCO, but not with a sawtooth core VCO.  But the VCO must
be designed with this in mind and the design is not trivial.

Paul H.




-----Original Message-----
From: motm@yahoogroups.com [mailto:motm@yahoogroups.com] On Behalf Of
gregorykjar
Sent: Wednesday, December 07, 2005 2:46 PM
To: motm@yahoogroups.com
Subject: [motm] Re: VCO FM question

Hi

Well, I didn´t want to make a complete DX7 replica. You can get a 
long way with just 2 VCO´s, with an EG and a VCA to control the 
feedback/FM. I´ve tried that in Reaktor, but then again thats in the 
virtual world. It would be great with real knobs.

Do you by "through zero" mean that it goes down to zero hertz and 
then through to "negative" (phase reversed?) frequencies? (within 
one cycle)
I realise this is probably not an easy design task. Just wishing :-)

greetings 

Gregory



--- In motm@yahoogroups.com, "Paul Haneberg" <phaneber@o...> wrote:
>
> 
> In order to do DX type FM you need the ability to linearly 
frequency
> modulate a VCO through zero.  While the MOTM-300 is capable of 
linear
> FM, it does not have through zero capability.
> 
> I'm unsure whether or not you need oscillators which reset to zero 
on
> the leading edge of a gate.  This may not be necessary, but I 
assume the
> DX series does reset to zero.
> 
> Even if the MOTM oscillator was capable of meeting the above 
criteria,
> you would need a very large system to replicate the DX7.  Six 
VCOs, Six
> VCAs, Six Envelope Generators at the minimum.
> 
> Personally, I would welcome a new MOTM VCO with these 
capabilities, but
> I haven't heard anyone else except Dave Bradley express the same
> sentiments.
> 
> Paul H.
> 
>   
> 
> 
> -----Original Message-----
> From: motm@yahoogroups.com [mailto:motm@yahoogroups.com] On Behalf 
Of
> gregorykjar
> Sent: Wednesday, December 07, 2005 1:50 PM
> To: motm@yahoogroups.com
> Subject: [motm] VCO FM question
> 
> Hi
> 
> I´m still a bit new to MOTM and dont have any MOTM VCO´s yet. 
(using 
> my old Korg Mono/Poly as main VCO´s) Can you do FM in the "Yamaha 
DX7 
> way", with it? (feeding/modulating it with its own or another 
VCO´s 
> output) Or is this only possible in a virtual digital domaine?
> 
> greetings
> 
> Gregory
> 
> 
> 
> 
> 
> 
>  
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>








 
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