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.
> Regards,
> Ralf


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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