Under certain circumstances, clicking the virtual keyboard in the Ultrabeat, EXS24 or Audio Unit instrument interface won't produce any sound. In this situation, the virtual keyboard in the Matrix window also fails to produce sound.
This issue only occurs when using multi-channel instances of instrument plug-ins on sounds that are assigned to outputs other than Main. If this happens, put Logic into play. Another solution is to play a MIDI note into the instrument, either from an external MIDI controller or the Caps Lock Keyboard in Logic, to resolve the issue.
This document will be updated as more information becomes available.
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