Doepfer

Right - now I see!! But your right it would be quite hard to do!!! That is probably why I couldn't get my head round it and would like a Module to do the hard stuff for me!!

David

www.movingisliving.co.uk

Sent from my iPhone 

> On 18 Nov 2014, at 16:56, florian anwander fanwander@mnet-online.de [Doepfer_a100] <Doepfer_a100@yahoogroups.com> wrote:
> 
> Am 18.11.2014 17:30, schrieb David Kellett davidkellettwoulf@yahoo.com 
> [Doepfer_a100]:
> >
> >
> > But I'm still not quite clear how I would create
> > a CV based on the rate of change of another CV
> >
> Thats where I jumped in: Getting a CV based the change amount of an 
> incoming CV is very tricky (see below).
> 
> While getting a CV based on the rate of incoming triggers (which is 
> proportional to the amount of change of the CV) is quite easy and reliable.
> 
> If you don't want to go the way via the triggers, then split the 
> incoming CV in a multiple. One path goes into a slew limiter and then 
> into a polarizing mixer; the other path goes straight into another 
> channel of the polarizing mixer. Mix the original full positive, the 
> slewed signal fully inverted. The output of the polarizing mixer will 
> now send a voltage, that is the higher, the faster the input CV is 
> rising. Unfortunaly it will be a negative voltage, if the input CV is 
> falling. That is the point where it gets difficult. You have to send 
> both signals also into a comparator, which will tell you whether the 
> voltage is rising or falling with an logical signal. With that signal 
> you can use a switch to add or bypass a inverter after the output of the 
> polarizing mixer. Thats it.... :-/
> 
> And btw: this will not show a true value of the changge amount because 
> the slew does not change linear. It would be better to have a CV-delay 
> instead of a slew limiter.
> 
>