Rhythm Pattern Presets for baby sequenc.

synthesist

I figured out, using a cd4040 binary counter allows you to change the rhythm of a sequencer in some amazing ways!
I am sure that I am not the first one who came up with this idea, but I was wondering why I didnt find any schematics on the web.

If you look at the drawing, youll see that the output of pin no. 5 has 2 diodes.
When you feed it to the clock input pin of a 4 step sequencer it makes it count like this:
1-2-3-4-1111-2-3-4-1-2222-3-4-1-2-3333-4-1-2-3-4444....

So this means that the outputs of the sequencer counts 1-4 very fast, then it stays at output 1 4-times as long as on the others til it goes on counting then it stays at output 2 4-times as long ... and so on.

If you unconnect the 4040s pin no. 5, the rhythm changes to a different way.
And there are many more crazy options. The cool thing is - that it is very controllable by using switches.

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diablojoy · Posted: Fri Oct 28, 2011 8:24 pm Post subject:

that is very interesting
would like to see it expanded to those other options you mention
and hear some samples of what you come up with

kaputtpanzer · Posted: Sat Oct 29, 2011 1:11 am Post subject:

I would love to hear some sample clips

synthesist · Posted: Sat Oct 29, 2011 3:12 am Post subject:

the soundsample is just one saw-oscillator modulated by the "rhythm-4-step-sequencer. it would be interesting to show you the led indicators and what they do, but I am sorry I dont have a cam.

It starts as a regular 4-step sequencer clocked by the diode output on pin no. 9. (Which is exactly half the frequency of the master clock)

At 00:17 I swich on all outputs together.

At 00:56 I switch on only pin 9 and 6. But there is a bug! Because on my 3-way switch there is still the output of the 2 diodes from pin 5. Although it shouldnt affect the output now, it still does it anyway.

So at 01:16 I cut off the cable to the swich and now it changes to a third preset rhythm.

I am gonna change my device, so I dont have to cut a cable everytime I wanna play the 3. preset Wink

Also I cannot play the clock faster than on the soundclip because the counter starts to freeze and thats really a pity. You can also use other combinations to reach the very same effect with a faster clock, but I have to figure out how to do that.

modular demo rhythm sequ.wav

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