[sdiy] trickey sequencer problem

[anthony]

I have a neat idea for a sequencer but I haven't really seen an example of 
it being doen the way I want to do it.

The inspiration came about from parts I already have in my bin and sticking 
to these is crucial for my design. What I have are five coaxial 50kOhm pots 
with pull switches. I also have solid Aluminum knobs to go on them along 
with matching knobs for normal single pots.

So I want a sequencer with a maximum of 10-steps with the option of using 
any number in between. I got the clever idea to use the pull switches to 
swap the positions of the control voltages in their sequence. This would be 
handy for switching in between 8 and 10 steps and so on.

I also want the control voltages to be individually and independantly 
available so that something else could be controlled constantly by that 
control voltage source without interference from the normal operation of the 
sequencer. This is the part I haven't really seen anyone do. The intent is 
to make a simple bass sequencer, but with a lot of options for controlling a 
number of external modules.

The three schematics that I have been colsulting are the Oberheim 
Minisequencer, Ray Wilson's sequencer and Ken Stone's Gate Sequencer. I 
really like the features of the Oberheim, but there are a number of things I 
wouldn't use and can't quite decide on anything. Ray Wilson's is awesome and 
I even have almost all of the parts, but I still haven't studied the 
circuits enough to implement any of it. I imagine I'd end up making it 
exactly as he has it, but this would not be using the parts I have in mind 
so it is not an immediate priority. Ken Stone's gate Sequencer is the one 
I'm looking to the most. Mainly because it seems very simple yet very 
effective. In fact I have no complaints at all about the Gate Sequencer. 
It's the implementation of the gate-to-cv adapter that wouldn't exactly work 
for me. I imagined using a combination of his joystick controller and this 
converter and something like an analog switch to switch on each voltage to 
its individual output and also to the summed output that Ken uses.

So ultimately my concern is what analog switch to use. I guess 4066's or 
would work, but would I have troubles if I wanted to use bipolar control 
voltages?

To recap so it makes sense here're the outputs I want:

i.) individual gate outputs

ii.) sequentially switched cv outputs (that can be swapped on their 
respective pots by the pull-switch)

iii.) constant cv outputs that correspond to the switched outputs (I haven't 
decided if these should have the option of being switched like the above or 
not - my first instinct says I'd only want it for the switched outputs

The idea of having them able to be switched was inspired by the realisation 
that setting it to be an 8-stage sequencer and then say maybe a 10-setp 
sequencer might be awkward and would reduce the number of readjustments when 
switching sequence length. Plus it has the appeal of being unique.

In addition I've been considering using the Synthacon filter here along with 
one of my Psycho LFOs and Rene Schmitt's (sorry if I spelled that wrong...) 
4069 VCO.