57 lines
1.9 KiB
HTML
57 lines
1.9 KiB
HTML
---
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layout: default
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title: Generic MIDI and Encoders
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---
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<p>
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Encoders are showing up more frequently on controllers. However, they use
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the same MIDI events as Continuous Controllers and they have no standard
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way of sending that information as MIDI events. Ardour 4.2 has implemented
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4 of the more common ways of sending encoder information.
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</p>
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<p>
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Encoders that send the same continuous values as a pot would are not
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discussed here as they are already supported by <code>ctl</code>.
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</p>
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<P>
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Encoders as this page talks about them send direction and offset that the
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DAW will add to or subtract from the current value.
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</p>
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<p>
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The 4 kinds of encoder supported are:
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</p>
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<ul>
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<li>
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enc-r: On the bcr/bcf2000 this is called "Relative Signed Bit". The most
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significant bit sets positive and the lower 6 signifcant bits are the
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offset.
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</li>
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<li>
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enc-l: The bcr2000 calls this "Relative Signed Bit 2". The most
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significant bit sets negative and the lower 6 signifcant bits are the
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offset. If you are using one of these two and the values are right but
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reversed, use the other. This one is the one the Mackie Control Protocol
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uses.
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</li>
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<li>
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enc-2: The bcr2000 calls this one "Relative 2s Complement". Positive
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offsets are sent as normal from 1 to 64 and negative offsets are sent as
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2s complement negative numbers.
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</li>
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<li>
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enc-b: The bcr2000 calls this one "Relative Binary Offset". Positive
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offsets are sent as offset plus 64 and negative offsets are sent as 64
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minus offset.
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</li>
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</ul>
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<p>
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If the wrong one is chosen, either the positive or negative side will act
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incorrectly. It is not really possible to auto detect which one the
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controller is using. Trial and error is the only way if the specification
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of the controller is not known.
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</p>
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<p>
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Many controllers have more than one choice as well, check the manual for
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the surface.
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</p>
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