I use Tascam US-I22 as midi/audio interface to PowerMac G5 and notes in the B4 get stuck frequently.
Native instruments believes that the midi driver of this card and others as well, are sending midi events with identical time stamps. This means that when you are let go of more than one key (2 note off events with the same time stamps are sent), and then our software does not process the note off message and you get hanging notes.
This is not common with most midi controllers or midi devices. Native Instruments are working on a solution, and the next B4 update will fix this issue.
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