SnipSign freeze due to MIDI buffer overload?

[esride-nik]

// usbMIDI.read() needs to be called rapidly from loop(). When
// each MIDI messages arrives, it return true. The message must
// be fully processed before usbMIDI.read() is called again.
if (usbMIDI.read())
{
processMIDI();
}

=> Maybe there are more than one incoming MIDI messages per loop. Try

while (usbMIDI.read())
{
processMIDI();
}

[geier1993]

Let me know what happens :)