[linux-audio-user] HDSPconf and sync

Mark Knecht markknecht at gmail.com
Thu Dec 23 21:54:12 EST 2004

On Thu, 23 Dec 2004 03:21:05 -0500, Kevin Ernste <kevinernste at gmail.com> wrote:
> Hi again -
> First of all, many, _many_ thanks to all HDSP coders and contributers,
> I've been using my multiface regularly for over a week and am
> enormously impressed by the quality of tools available for this
> card...and I can't imagine how ever I did without the matrix mixer ;)
> Regarding the HDSP multiface and HDSPconf:
> As I understand it, this card has two "speeds", single and double
> corresponding to approx '48k and under' and 'over 48k' respectively.
> I'm interested in 44.1K and 96K.  So:
> - Shouldn't the sampling rate (and "speed") be switching automatically
> based on the rate of whatever file is being played (or based on
> whatever rate a new JACK server requests, etc), am I missing
> something? I've been setting the rate manually with HDSPconf or via my
> play script with amixer (numid 11).


   Well, it should be.....but it doesn't, between the two speed 'ranges':

Range 1 - 44.1K/48K
Range 2) 88.2K/96K

Jack can switch between either rate in each range, but for whatever
reason it cannot switch between the two ranges themselves.

If you are running at 44.1K, you have to use hdspconf to switch to
either 88.2K or 96K. Jack could then switch from whichever you chose
to the one you want. Same for going down to 44.1K from 96K. You'll
have to do that in hdspconf also.

I know - it's a hassle.

> - Perhaps related, should I be able to set the sample clock source to
> "AutoSync" (it won't stay toggled) even without external digital
> connections?  Is this lack of "Internal" AutoSync what's breaking
> sampling rate switching/handling as mentioned above?

I'm not sure about this. I use my HDSP 9652 as the system maste clock
and sync Pro Tools to it, as well as syncing my Hammerfall to it. I
use autosync on the Hammerfall ( I think - I'm not at home right now
to check) and it works fine for me.

Good luck getting things straghtened out.

- Mark

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