Re: [LAD] ALSA MIDI latency test results are far away from reality

Ralf Mardorf wrote:
> 1.
>
> I disconnected all audio connections for JACK and connected hw MIDI in
> to hw MIDI out.

Is this connection through JACK or through ALSA, i.e., does it show up
in the output of "aconnect -l"? From what I understand, JACK's sample-
synchronous timing always adds latency, and might add period-related
jitter depending on the implementation.

> Yamaha DX7 --> Alesis D4 results in a 100% musical groove.
> Yamaha DX7 --> PC --> Alesis D4 results in extreme latency,

With a single MIDI loopback cable, the latency test program tests
a "PC --> PC" connection. A more realistic test would be
"PC1 --> PC2 --> PC1" (or just one PC if it has two inputs and two
outputs).

Regards,
Clemens
_______________________________________________
Linux-audio-dev mailing list
Linux-audio-dev@email-addr-hidden
http://lists.linuxaudio.org/listinfo/linux-audio-dev
Received on Fri Jul 16 20:15:03 2010