[linux-audio-user] HDSP 9652 MIDI Timing

[Mark Knecht]

Paul,
   I've done a bunch of work over the last few days with a problem I was
experiencing using Rosegarden to play MIDI and then receive and record
the audio from external sound sources in Ardour.

   First, yes, it really works, and actually works pretty nicely. Jack,
Ardour and Rosegarden are all playing nicely together.

   However, I have found that:

1) There is a severe timing problem when using the HDSP MIDI interface
under Linux. Over time the HDSP 9652 just gets further and further
behind.

2) There is no problem with the HDSP MIDI interface under Windows. 

3) Thee is no problem with the MidiMan 2x2 interface under Linux.

   The problem seems to be pretty clearly the way the Linux stack is
using the HDSP 9652 MIDI interface. I'm guessing it's a driver problem,
but I don't want to color the perception.

   I know it's a newer driver. How can we go about debugging this and
getting it fixed?

   I can post mp3's of all these cases for people to hear if it is
desirable. I have lots more technical data to relate once we decide how
to go about solving the problem.

   Thanks in advance! The fact that I have all this software working as
well as it is is a great accomplishment for me, and due to a lot of
great programmers out there like you guys!

Cheers,
Mark