On Tue, Nov 18, 2014 at 8:18 AM, David Kellett davidkellettwoulf@... 1 < Doepfer_a100@yahoogroups.com > wrote:

 

I sort of follow that (I think) but I'm not sure how the LFO as clock works in this - I don't want a regular gate but a gate that occurred only with a change of CV. So imagine that an LFO signal (possible modulated so it is not quite regular) goes into a quantiser (not A156!) and the quantiser puts out stepped voltages - I want a gate when the stepped voltage changes. (The reason NOT the A156 is that the uScale gives greater choice over what notes I'm quantising to) 

Maybe I've misunderstood the use of the LFO clock in your patch

David

www.movingisliving.co.uk

Sent from my iPhone 

On 18 Nov 2014, at 10:25, florian anwander fanwander@... 1 < Doepfer_a100@yahoogroups.com > wrote:

 

Hello David

Am 18.11.2014 08:38, schrieb David Kellett davidkellettwoulf@...
> 1) To create a CV based
> (proportional to) on the rate of change of another CV

> 2) To create a gate when there is a step in a CV.

You've got several examples to solve the part #2 of your request; I call
it the change-to-trigger-converter, abbreviated CTC. As soon you have
this function, you will be able to create the rate-to-CV function:

You may do this on either on analogue level or with the help of methods
know from an A/D- an D/A-converters respectively.

The analogue method requires, that a change in the CV creates a trigger
pulse, which has always the same length and voltage: load a capacitor
with this pulses, unload the capacitor over a fixed resistor, and pick
the resulting voltage with a buffer. The more often a pulse arrives at
the capacitor, the higher will be the voltage at the capacitor.
The disadvantage of this method is, that the voltage will always start
to drop, until the next trigger comes in.

The digital method is: have a clock running a digital counter, that
counts up. The trigger from CTC stores the value of the counter in a
latch, and resets the counter. The value of the latch is D/A-converted
into a voltage.
Unfortunately you need a lot of modules for this:
one LFO as clock
one A160/161 as counter
three A-148 as latches
two A-138a Mixers as simple D/A.

This will be a 6Bit version.

Florian

@Dieter: do you pay commission if I recommend module-consuming patches ;-)