64 lines
2.5 KiB
HTML
64 lines
2.5 KiB
HTML
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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.
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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 7 bit encoders supported are:
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</p>
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<ul>
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<li>
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enc-r: Relative Signed Bit. If the most sign bit is set, Then
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the offset is positive. The lower 6 significant bits are the
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offset. <code><Binding channel="1" enc-r="13" …</code>
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The offset value is formed as <code>0svvvvvv</code>. Where s is the
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sign or direction and vvvvvv is the number of ticks turned.
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</li>
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<li>
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enc-l: Relative Signed Bit 2". If the most sign bit is unset,
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Then the offset is positive. The lower 6 significant bits are the
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offset. This is the same as enc-r but with the direction of turn
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reversed. This is the method the Mackie Control Protocol
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uses. <code><Binding channel="1" enc-l="13" …</code>
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The offset value is formed as <code>0svvvvvv</code>. Where s is the
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sign or direction and vvvvvv is the number of ticks turned.</li>
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<li>
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enc-2: Relative 2s Complement. Positive offsets are sent as normal
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from 1 to 64 and negative offsets are sent as 2s complement negative
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numbers. This is a signed 7 bit int.
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<code><Binding channel="1" enc-2="13" …</code>
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</li>
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<li>
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enc-b: Relative Binary Offset. Positive offsets are sent as offset
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plus 64 and negative offsets are sent as 64 minus offset. 64 is zero,
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65 is +1, 63 is -1. <code><Binding channel="1" enc-b="13" …</code>
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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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14 bit encoders are also supported with:
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<ul>
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<li>rpn-delta - The value is expected to be a signed 14bit value
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that is added to the current value. For use with encoders</li>
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<li>nrpn-delta - The value is expected to be a signed 14bit value
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that is added to the current value. For use with encoders</li>
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</ul>
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