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Rotary Sensors and Continuous MIDI data

Feb 09 2006 | 7:35 pm


I have the following problem:

I have a rotary wheel sensor, which gives out MIDI values roughly from 0 to 127. Now, I want to use it to play an audio file by granulation, so that I can roll along the sample. The rotary sensor’s midi value jumps to its minimum after it reached its maximum. for now i simply used a counter to get continuous data (0 to a very large number). I don’t really know if that won’t lead to problems. I want to read every sample in the buffer according to the rotation speed of the wheel. To make the patch understand, that the movement is backwards I want to compare the previous value with the current one. Is there actually an object, that does that for me?
After scaling the values for very slow movements, I used a line~ object for interpolation. Unfortunately with that it doesn’t seem to be possible to play the file faster than it’s original speed.

well, i see how i get on, but any ideas are very much appreciated

thanx a lot

Feb 11 2006 | 12:37 am

could do it all with groove feed the sample into a circular buffer of about 30 seconds then control the speed of playback with groove maybe. Could scale it so you could have something like -5 to 5 each side – using the wheel like a continuous pitch wheel- hope that helps.

Feb 15 2006 | 11:35 am

Two things to consider: I don’t know which continuos Midi rotary you
use, but I bet you can set it to different modes: The one you want is:
Increment decrement. turning it right it will spit out low numbers
(1-5), turning it left it will spit out high numbers (122-127) to be
interpreted as complementary negative numbers. You then have to
accumulate these values (the high ones subtracted by 128).

The soultion beside doing it yourself (what I recommend):
St.Dialin from my St.ools.
The other if you can’t change the behaviour of your device: I have in my
abhaXions a abstraction which does the opposite of a modulo operation,
it will count on… Its called [!%] (to be translated "not modulo".
Find it at c74/share.


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Stefan Tiedje
Electronic Composition

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Jun 08 2006 | 11:23 pm

oh, sorry, i completely forgot this thread, cos time was running out, but ifound solutions in the end. anyway, thank you very much for the suggestions here, it’s very much appreciated.

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Forums > MaxMSP