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Table Of Contents
125Logic Pro User Guide
Stop local sound generation for MIDI devices in Logic Pro
If your MIDI keyboard has an internal sound source, it’s important that you stop the
keyboard from generating sounds directly from its own keyboard.
For example, if you buy a new keyboard to be used without a sequencer, and connect it
to an amplifier, you would expect the device to make a sound when you press its keys—in
other words, the keyboard is directly connected to the sound generator.
When using the MIDI keyboard with Logic Pro, however, this is not what you want to
happen. In this situation, the keyboard is used as a computer input device, and Logic Pro
passes the incoming performance information back to the keyboard’s sound generator (or
to an internal software instrument or another connected sound module, if you like).
If the direct connection between the keyboard and its tone generator isn’t cut, a doubling
of each note results—one played directly from the keyboard to the internal tone generator,
and another sent through Logic Pro back to the tone generator.
Not only does this cause a phased sound, but it also halves the polyphony of the
keyboard’s tone generator. In situations where you want to control or record another sound
module or software instrument with your keyboard, you would hear both the keyboard
sound (due to the direct keyboard–to–tone generator connection) and the sound of the
software or MIDI instrument. This is why the keyboard must be separated from its own
internal sound generator.
This function is known as Local Off, and is set directly on your keyboard. Don’t worry
about losing the ability to use the tone generator of your keyboard. Logic Pro will still be
able to communicate with your keyboard tone generator just like any other connected,
keyboardless sound module or software instrument.
Note: If you can’t find the Local Off function in the MIDI menu of your keyboard, check its
manual on sequencer use. Some keyboards allow you to select fromLocal, MIDI, or Both
for each of their Parts (individual MIDI channels/sounds in multi-timbral MIDI devices). The
MIDI setting, if applicable to your keyboard, is the equivalent of Local Off.