posted 19 December 2006 20:34            

A: If you paste the following code into a SoundToGlobalController, it will generate indexes of randomly selected switches, choosing ONLY from among those switches that are currently turned ON. Then you can use these index values to look up other values from an array.

posted 08 January 2007 05:32            

| ctrls index count step expr tick |

ctrls := {(1 to: 8) collect: [ :i | !sw suffix2: i]}.

index := EventVariable new.

tick := 1 bpm: !BPM.

count := ctrls inject: 0 into: [ :a :b | a + b asLogicValue].

step := tick countTriggersMod: count.

expr := (index <+ (step + 1)), 0.

ctrls do: [ :sw |
expr := expr,
(sw
true:
(((index <~ (index - 1)) eq: 0)
true: (ctrls indexOf: sw)
false: nil)
false: nil)].

expr

It works fine, but there is often a rhythm jump when a switch comes in and out - I wanted to make it only execute the block

count := ctrls inject: 0 into: [ :a :b | a + b asLogicValue].

if tick was on the positive edge of its trigger cycle - but I ran up against ' HotVariables cannot ... ' every time I tried to make a conditional to check the status of the tick ( whether logic high or low )

posted 08 January 2007 06:43            

RhythmicArrayExplorer.kym

I made a sound from the modulo stepping version of the code above, it is great for exploring interesting poly-rhythms and how they can be generated from simple pitch and volume and accenting.

posted 08 January 2007 13:36            

index := EventVariable new.
tick := 1 bpm: !BPM.
ctrls := ({(1 to: 8) collect: [ :i | !sw suffix2: i]}) collect: [ :ctrl | tick sampleAndHold: ctrl].
count := ctrls inject: 0 into: [ :a :b | a + b asLogicValue].
step := tick countTriggersMod: count.

Try replacing the beginning part of the code with this and see if it does what you want. This will make it so that the stepping code sees the switches change only on the beat.