[PD] reverse & variable speed soundplayback?

[Frank Barknecht]

Hallo,
robbert van hulzen hat gesagt: // robbert van hulzen wrote:

> thanks, though i don't really i understand this (i ran into the same problem
> with your 'tabread4~ help' post from august): putting a [*~] after the
> [vline~] affects the volume, doesn't it?

Not if the [vline~] isn't controlling volume but the position of
array-reading as in sample-playing with [tabread4~]. There you use
the [vline~] that goes into the [tabread4~] to control, which sample
position [tabread4~] is currently playing. 

Compare this to the non-signal [tabread]: You send a number into
[tabread] and it will output the value the array has at the position
the incoming number specifies. So if you send a 0, you get the first
value in the array, if you send a 1 you get the second, if you send a
4411 you get the 4410th value. [tabread] starts counting a 0.

Now [tabread4~] is very similar to that, only it wants a signal coming
in. Assume that instead of [vline~] you use [sig~]. [sig~ 10] sent into
the inlet of [tabread4~] will output the 11th sample of the array.

See attached patch for an illustration of this. 

Now if you have a vline~ going from 1 to 11 into tabread4~, it will
play the 10 samples from 1 to 11 (counting samples from 0). What
happens if you multiply the vline~-signal with 2? It will go from 2 to
22 then , using the same time as before.  This will play twice as many
samples: samples 2 to 22, if there are that many, and it will result
in a chipmunk pitch shift of one octave higher than before. 

Ciao
-- 
 Frank Barknecht                 _ ______footils.org_ __goto10.org__
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