[LAU] Is -Xalsarawidi the same as -Xraw or -Xseq?

[Ralf Mardorf]

On Tue, 19 Jun 2018 07:45:40 -0700 (PDT), Len Ovens wrote:
>Beside that jitter has to be pretty low frequency to be an issue. Not
>that jitter is ok, but that MIDI itself is an issue already before it
>gets to the computer.

Hi Len,

I won't comment this claim or any other claim in this thread.
Measuring a system by itself could be questioned, but The OP should
consider to measure different MIDI interfaces, the results might or
might not be something to keep in mind.

$ alsa-midi-latency-test -l

The output of the above command does show the port(s), replace xy:z of
the below command by a port. Connect MIDI in with MIDI out and run

alsa-midi-latency-test -Rrw=5 -ixy:z -oxy:z

After running the above test, the OP should chose the best MIDI
interface and launch jackd with and without alsarawidi. IOW the OP
should record a four-to-the-floor MIDI track and after that record an
external MIDI instrument's kick several times, to one audio track after
the other. How exact are all the kicks played in unisone? Is it just a
phasing, or an early reflection alike effect the OP hears? Is there a
difference between the tracks recorded with and without alsarawidi?

There's no need to answer this questions by an email. Everybody
interested could do this, just to verify if it's something important to
the tester.

https://github.com/koppi/alsa-midi-latency-test

Regards,
Ralf