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Mubu.granular transposition and playback

MuBu
#1

Hello List,

I had a question about the transposition setting of mubu.granular. While looking at the help file and trying out the synchronous mode section, it’s not clear to me how the transposition feature works.

It’s explained that “set transposition (sets relative period) [0]”, but what does that do exactly? I didn’t find any explanation anywhere else. Does it mean I could also just edit the relative grain period?

Also, when using a transposition different than 0, the sound output is ok if I use the command “position 0, position 3000 3000”; but it has more artifacts if I send the discrete values with a line (also prepended with “position”). What is the difference in method?

So, to play a sound randomly around a buffer and also transpose it while keeping sound quality, how should go at it?

Best,

jmmmp

 

 

#2

Hi jmmmp,

Apologizes for the very late answer (won’t happen anymore when the automatic notifications are added to this Forum)…

The “transposition” message is actually an alternative way to control the relative period in cent instead of a linear factor.

This doesn’t really make sense for conventional asychronous granular synthesis, but for the synchronous mode that is enabled when you assign a marker track to mubu.granular~

You can produce such a marker track with mubu.process using the pipo.psy analysis plugin (see patch below).

Please, note that synchronous granular synthesis just works for harmonic sounds – that can also include noise segments – such as voice or monophonic instruments. For other sounds you may want to try SuperVP for Max.

About controlling the position:

When you use the line object, the temporal resolution of the output ramp position depends on the second argument that you give to line.

If this value is equal or less than the grain period of mubu.granular~, controlling the position with line should produce a comparable sound quality to adding a second argument to the position message.

You should also be able to send a list to mubu.granular~. The latest version of the external reacts on this list in the same way as the position method but stops playing when reaching the requested position.

Best

Norbert


  

  
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#3

Thanks for the patch.
And sorry for reviving this topic.
It does feel really tedious and weird for “just” transposing grains. I had to search a looooong way to find a solution. That would be cool if there was an automated process for this, in my opinion.

#4

Can you explain what you’re trying to do? Note that the example patch uses synchronous granular synthesis (PSOLA).