ProbabilityDotCom.mov

YouTube via davidryle | August 21, 2010

"A lame attempt at trying a patch challenge. The idea was to have the third row of a Q119 sequencer to set the probability of an event. This was partially successful but still isn't quite 100%.

Basically, the output of the first row is for pitch, 2nd row is for gate on/off and 3rd row is for probability.
The use of a Q118 Instrument Interface was key. The "threshold" allowed me to fine tune in when an even t would occur. I used a Q110 Noise source to a Q107 filter in low pass mode before sending it to an amplifier which was controlled with the 3rd row of the sequencer. The voltage of the 3rd row was sent through a Q125 Signal Processor and then a Q117 S&H to derive useful voltage for the amplifier. The amplified/filtered noise was sent to the Instrument Interface which produced a gate to send to the Q128 Switch. The Switch was controlled by the 2nd row and allowed the "probability randomized" gate to come through when a step was selected by the 2nd row of the sequencer.

Whew!

Don't ask why it works, but it does as you can see. The steps that are active (most of the time in the video) are 1, 3 5 & 6. Step 3 is 50% probability, and step 5 is 30%. Steps 1 & 6 are 100% (or close).

The whole thing is not quite perfect. I tried many combinations to get this one. I had plenty of ideas such as using the filter and S&H to limit the noise selection, and most of the real problems occurred because of trigger problems.

The astute will notice the second step will fire regardless of whether there is a "probability" of it or not. Of course this is controllable with the 2nd row voltages and can be prevented.

I think someone could use the Q118 Instrument Interface and the S&H modules to get a better go at this, but I ran out of time."