I mentioned this on #milkymist before: after a while of playing
with MIDI, rendering starts to stall briefly when there are is a
burst of messages. If I force a high enough message rate for long
enough, the M1 even hangs completely.

Here is the video to prove it:

http://downloads.qi-hardware.com/people/werner/m1/midi/MVI_1755.MOV

00:04 rendering stops briefly if I move the KP's slider (assigned
      to wave_x) rapidly up and down
00:08 this also happens with the nK2's slider assigned to wave_r
00:12 also with an unassigned slider (that still sends MIDI
      messages, of course)
00:15 the pad is no different (except in the Y direction, but I'm
      probably just too slow there)
00:22 rapidly generating a lot of MIDI messsages eventually ...
00:28 ... hangs the M1
00:32 also click-to-GUI doesn't work anymore

The M1 had an uptime of a day or longer with a fair amount of
MIDI use then I did this experiment. This is the second time I
see this behaviour, under similar circumstances.

I plugged in JTAG after the hang and the serial console doesn't
answer either. Firmware is plain vanilla 2011-07-13.

Any suggestions ?

- Werner
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