Sequencer Idea

[ToAd]

Tony,

I experimented a bit around this idea of yours and came up with some 
remarks...

You'll want a glide circuit on the output.  Or even cross fading VCA's. 
Especially when in sampling mode.
I came up with this while testing. I actually used 8 oscillators as 
input. Every step had it's own VCO. When the step was active, the vco 
connected to this step was send to the output.  Here cross fading VCA's 
would be fun. Especially if you could alter the amount (or time, or 
slope) of cross fading. Not exactly what you described, but fun anyway. 
(the output level depends on the position of the knob, this is also 
nice, but probably also part of your concept) Actually this part is like 
the interpolating scanner from Jurgen Haible.

Later I connected all sorts of CV's (LFO's, EG's,...) to the inputs, 
this is when you'll want a glide circuit.

One issue occurred to me when testing this setup with a sample and hold; 
if you're using the master trigger and a master CV input, all the steps 
end up with the same value. So instead, I clocked the sample and hold 
from the same clock as the sequential switch was running. This was more 
fun, but not so interesting, I could have just used the S&H to obtain 
the same result. So Luckily I have 3 S&H modules, and experimented some 
more. Having a S&H on each step is probably what you described, and 
would be very cool. In that case you'll want some routing of the output 
signal, so you can actually create multiple "evolving" outputs. (the 
outputs could be the sum of a couple of "selected"  steps, or even some 
more complex algorithms). I think this part should be done digitally, 
with a nice (transparent/flexible) interface

Next on my to do list is to find out how I can skip steps or change the 
order the steps are activated. I'll need to hack the sequential switch 
as i don't think I can do that with the modules I now have.

Thanks anyway, as this was a nice excuse to spend some quality time with 
Beelzebuffo!

ToAd

Tony Scharf schreef op 07/01/2014 21:47:
> I've had this idea for a sequencer module for a while (how you could 
> do this with MIDI, I just don't know).  Here goes..
>
> It's an 8 step sequencer.  With 8 identical columns and a control 
> section. let me start with the channels
>
> at the top, each channel has a CV knob 0 to 10v. Pretty standard so far.
>
> Under that is a switch with 3 positions (Knob, Sample , Track).
>
> Under that there is a button to trigger the Sample and an input jack 
> that accepts a trigger or gate to initiate sampling.
>
> When that step of the sequence is active, here is what happens in the 
> different modes:
> Knob - standard behavior.  Whats on the knob is what is output
> Sample - the output of a Sample/Hold circuit that takes the value of 
> an external input.  if you don't plug anything in, it uses an internal 
> noise source.
> Track - the output passes whatever is at the input.  If nothing is at 
> the input, the noise is output (why you want that, I don't know).
>
> here is where it gets tricky to explain.
>
> the control section has a clock and reset input as you would expect, 
> but it also has a master sample trigger input and master sample input.
>
> The master sample input is normaled to all the channels inputs and 
> breaks the normal from the noise source if something is plugged in 
> there.   The master sample trigger is the same way.  A clock pulse or 
> trigger there will cause all 8 channels to take a new sample.
>
> The idea is that you can have random patterns that repeate, but you 
> can change any channels value by either manually triggering a new 
> sample be taken or telling the whole thing to take a new sample.
>
> oh, each channel also needs a trigger out for when that step is 
> active.  a trigger out from one channel could be used to for another 
> channel to resample or even to tell the entire unit to resample.  Lots 
> of possibilities in patching.
>
> Also in the control section, I would want to lift something from 
> Future Retro Ravolution.  I'd like an offset knob that changes the 
> step output order. a value of 0 (center) makes the sequence play 
> normally.  set it to 1 and the sequence skips every other step. 
>  2..skips two steps..etc. set it negative, and the sequencer jumps 
> backward the same number of steps.  set to odd numbers you can get 
> evolving patterns to break up the monotony.  You can use a reset jack 
> to always go back to step one at any time.
>
> I did a drawing on paper. I can put that into a digital diagram or 
> something if you like.
>
> Seriously, I would like to see this made.  I've built up simple 
> versions of it using individual modules but it's just crazy enough to 
> be the kind of thing I think the euro community would love.
>
> I think you could sell that for about $250 to $350 USD or more.   
> Sequencers are pretty hot items in the euro crowd.
>
> Tony
>
>
>
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