[LAT] To much latency

Dave Stikkolorum davers at dds.nl
Sun Oct 30 14:39:14 UTC 2011

On 30-10-11 15:19, Jeremy Jongepier wrote:
> On 10/30/2011 03:13 PM, Dave Stikkolorum wrote:
>> I have jack 1.9.7
>> if I increase to 48000 qjackctl gives 42.7 ms. (21.3 when using 
>> 512/period)
> You can decrease the latency by lowering the number of frames. It is 
> now set to 1024, try 256 or even lower. I use a setting of 64 or 128 
> when using a MIDI keyboard with a softsynth or sampler.
>> how would i see the improvement with /usr/bin/jackd -S ?
>> it doesn't change the expected latency in qjackctl when I do that.
> No that's right. But it might improve performance of JACK regarding 
> xruns. -S means Synchronous or basically the ol' Jack1 way, some 
> soundcards work better that way.
Ok, you use the realtime option also?
>> One of the annoying things is the delay between the midi keyboard
>> and the actual sound. I guess it has to do with the one we are tuning
>> now, right?
> Yes, the lower the latency, the lower the delay between pressing a key 
> and hearing the actual sound. With a frames setting of 64 at 48Khz 
> system latency will drop to 2.67 ms (64/48000*2). Those are the kind 
> of latencies you want when using a MIDI keyboard.
ok, i see, i will try some stuff later tonight, because I am not having 
a setup with a keyboard attached now.
I also will try to find out what my other pci card was on the desktop


> Best,
> Jeremy
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