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Old 08-19-2018, 09:13 PM   #17
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Join Date: Mar 2008
Location: Planet Earth
Posts: 5,039

Originally Posted by osxmidi View Post
Seeing that you are using a Ubuntu try the Liquorix kernel

Open a terminal and enter

sudo add-apt-repository ppa:damentz/liquorix && sudo apt-get update

and then

sudo apt-get install linux-image-liquorix-amd64 linux-headers-liquorix-amd64

and reboot

The stock kernels are not the greatest for audio and the Liquorix kernel is probably a better option.

Another thing is installing rtirq

Download the appropiate deb file and then open a terminal and enter

sudo dpkg -i debfile.deb

I've got the same Delta 24/96 cards and they can be ok with the right kernel and rtirq.

I've also got a M-Audio Revolution in an i7 and Windows 10 and I can't seem to get less than 8ms input latency when recording.

Recording with things like LinVst is probably not going to as good as playback.

What synth is LinVst having problems with?, I'll look into it.
Performance wise, just swapping out to the low-latency kernel and priority overrides has gotten my machine capable of running 64 samples latency with any softsynth and no artifacts. Even my 25 track test song with 12 Windows VSTi softsynths and 54 other Windows VST plugins now plays smooth. If I get to a point where I'm exhausting the system again, I will look into the Liquorix kernel and the other tweaks you mentioned.

The synth with the anomaly is this freebee simulation of an Oberheim Two Voice.

When I load my test song up and open the UI, it is sitting on the correct patch, but sound-wise it is not. Then just clicking the same patch that shows as already being selected, all the dials on the synth change, and the becomes the correct sound.

My next quest will be to figger out a construct of this line,

/usr/bin/jackd -R -dalsa -dhw:M2496,0 -r44100 -p128 -n2 -Xseq

that will include "-dhw:M2496,1", because I can only access the first of the two cards in REAPER so far. In Windows, selecting ASIO makes them both show up so I have four analog inputs.

Thanks to you and Jack for all the help.
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