Key "Ab" doesn't allow sound on 3 simultaneous keys pressed
Virtual MIDI controller for Linux, Windows and OSX
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VMPK allows playing chords with 3 notes or more - except when using the note Ab or G#. On a standard QWERTY keyboard, it happens when using the keys H and 6, for instance. It plays only 1 or 2 notes, even when pressing 3 keys. You cannot play the chord for E, for instance.
I can reproduce this bug with any instrument (program), octave, transposition or operating system. It happens on Linux and FreeBSD as well.
I forgot to tell: using 0.5.1 here.
This is likely a hardware limitation, due to a cheap/bad computer keyboard. Try with another computer keyboard, and check if your keyboard is "anti-ghosting":
http://www.microsoft.com/appliedsciences/antighostingexplained.mspx
This has been discused here several times.
You are right. I could reproduce the same behavior in the applet on that page. This is not a VMPK bug. I'm sorry, and thank you, very much.