В том и ответ - тормоза проца. Простейшие контроллеры по скорости не различаются.
Маркетологи Rocktron придерживаюцца несколько иного мнения
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The MIDI Xchange provides "SMART CONTROLLERS" not commonly seen in low-cost MIDI footswitches. What are SMART CONTROLLERS? Typically with most MIDI footcontrollers, when using continuous controller pedals the "status" of the pedals are not reported when a new preset command has been sent. This would most likely cause a discontinuity in volume requiring the user to step on his volume pedal to correct the change, thus updating the pedal status manually. The MIDI Xchange issues "current status" of both controller pedal ports upon the recall program change command being sent out. Also, auto enable of these controller messages are detected when any of the two ports have a pedal attached to them. Everything is handled by the MIDI Xchange for ease of use!
An example of this would be – when you reduce the volume of preset 1 with an expression pedal – when switching to preset 2, unlike other typical MIDI controllers, the MIDI Xchange will automatically detect the position of the pedal and apply that to the volume of preset 2 – thus no loud or abrupt volume changes. This is ideal in a live situation.
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