Hi Mickey

I am coming back to your question regarding a Delay for CVs.

>> Dumb question.. What is a simple way to delay a control voltage say
>> I have a CV coming in from a source (analog sequencer) and it feeds to
>> an OSC, and I wish to delay the same CV and feed it to another OSC..
>> Any idea>>

I wrote then:

> I could imagine a patch consisting of two S&H Modules, CV-Switches and
> some digital control (Flipflop that switches between the S&Hs). This is
> not really a final thought, but I think it should work. But(!): this
> won't delay any continous CV-changes.

Then I wrote a message with an patch suggestion, that assuminlgy never
left my computer (I did not find it at yahoo). I tried it yesterday and
could refine it to the following setup:


Gate -------+-----------+
| |
| 1/2 <- this is a divider
| |
o |
/ <----------+ <- this is a VC-switch
+--o o-+ |
| | |
CV-+------+--------+ |
| | | | | |
| +->S&H1 +->S&H2 |
| | | |
| +--o o-+ |
| /<-----+ <- this is a VC-switch
| o
| |
| Quantizer
| |
VCO1 VCO2


The basic idea is:
S&H1 stores the actual CV while VCO2 is controlled by S&H2 (the first
step will be something uncontrollable...). The next gate causes the
divider to toggle. The toggle switches the VCO2 to the S&H1 out and
stores the CV of the second step in S&H2.
Next gate toggles the divider. VCO2 gets again S&H2 and S&H1 is loaded.
And so on...

The Quantizer before the VCO2 is required, at least for the use with an
old A150. The problem is, that the A150 (VC-Switch) has a lot of
influence on the CV. I think it is cuased by the CD4053 CMOS-Switch,
which is used by the old version of the A150. This has still a 100 Ohm
resistance when closed.

I don't know whether the new version of the A-150 (with DG-409 instead
of CD4053) makes the Quantizer obsolete.

The patch itself works really fine. If you play a single line of
harmonic steps you get nice chords.
The patch could be extended assumingly to an two-Note arpeggiator by
adding an A-156 with harmonic quantizing at the CV-Input of the whole
patch, which is fed by a triangle or saw from a LFO.




Florian