posted 16 February 2012 07:25            

I know it's possible but because I was a bad pupil in my Maths classes and always hit too many walls when I try to code in Capytalk, I cannot do it!

Any help is much appreciated.

posted 16 February 2012 10:55            

code:

---

| sum |
sum := [:n | (n = 1) ifTrue: [1] ifFalse: [(sum value: (n-1)) + n inverse]].
sum value: 10

---

posted 16 February 2012 11:02            

For example, say you wanted to use 100 terms from the series (that gives you a range of approximately 1 to 5 as your speed multiplier). You could use:

code:

---

| sum |
sum := [:n | (n = 1) ifTrue: [1] ifFalse: [(sum value: (n-1)) + n inverse]].
(100 * !Speed) of: (1 to: 100 collect: [:m | sum value: m])

---

Is that the kind of thing you had in mind?

posted 16 February 2012 15:25            

So I'm thinking your last reply will work. It would be great to be able to interpolate between the steps- which is essentially a f(x)=1/x curve.

However you have reminded me that 100 terms will only give me a factor of 1 to 5! What I really want to do is model an artists visual perspective, which (remarkably) works on harmonic principles- the classic railway track single view perspective has the sleepers recede in a harmonic sequence. So I was hoping to apply this to tempo and run the tempo to infinity, but of course a harmonic series is divergent. But maybe I can get that effect at least.

posted 16 February 2012 15:38            

On thinking more- if I could input f(x) =1/x as a tempo curve expression with a choosable initial tempo, it would be great. As far as I can tell, this curve is an harmonic curve as any two points on the curve produce their harmonic mean on the curve

posted 16 February 2012 19:58            

Strange..It's what I thought the 'Time Control' Sound would do- it does seem to accelerate, but only the timeline, not other Sounds lying concurrent in the timeline, even if they have !BPM parameters- is that right?
In the manual it says Time Control.......
"Slows down or speeds up the rate that time is progressing in its Input by controlling how the time counter is incremented on the signal processor. This affects only the start time of events within the Input (e.g. if Input is a Script or Concatenation or contains TimeOffsets), not the sample rate."

posted 16 February 2012 20:20            

timelinewithacceleratingbpm&cursor.ktl.zip

However, you could use a SoundToGlobalController to generate an accelerating BPM. Then you could link the track bpm to that accelerating one. The attached Timeline has both an accelerating TimeControl and accelerating BPM, just to show an example. You probably don't need both of them; if your Sounds depend on BPM, then the bpm one alone is probably the one you need.

(There's a description of how to link two track controls to a shared master control on page 80 of Kyma X Revealed. )

posted 17 February 2012 06:04            

Best wishes to Kyma Central!