MIDIPP - music production with FreeBSD?!
Hans Petter Selasky
hselasky at c2i.net
Sun Nov 25 20:12:25 UTC 2012
On Sunday 25 November 2012 20:35:53 Ralf Mardorf wrote:
> On Sun, 2012-11-25 at 20:08 +0100, Hans Petter Selasky wrote:
> > I wrote this simple tool to be able to handle more than stero. The device
> > I've got provides 7+1 channels playback and recording. I didn't check if
> > jack supports that. Also there are some problems with audio delay and
> > such when using jack. Probably not configured properly. And I needed to
> > have control on sample rate drifting with regard to input and output.
> > VirtuallOSS is using cuse4bsd to provide a non-resampled audio device.
> This is the same jack as for Linux? If so, jack doesn't add latency and
> can handle more than enough ports. Latency is from the backend/hardware
> and the clients have to provide the ports. Jack doesn't do resampling.
> It's impossible to misconfigure jack in a way, that it will add latency.
> Much more, on Linux the -Xalsarawmidi switch for jack2, aka jackdmp (not
> for jack1, aka jackd) does enable zero MIDI jitter, when using good MIDI
> devices, IOW PCI and PCIe devices, USB always will produce MIDI jitter.
My observation is for example that Zynadsubfx produces noticable less delay
when using the OSS backend versus using the JACK backend. I have not
investigated why. Thanks for your insight.
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