LATENCY, mostly TOTAL LATENCY

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Jim,
I run an older MacBook Air with the UMC 404HD On initial setup, latency will be around 10 with the core audio. Changing the frame size,( I think it was that setting name)to 1ms experimental and I get 7.4. I have been happy there.  I’ve made a few other tweaks, etc. And it’s been stable. 

I’m pretty sure the 202, and 204 would do about the same. The biggest advantage to the 404 is the number of inputs. With one mic you probably don’t need 4 inputs for JK?

Let me know if I can help.

Hi Moose and Hans  - thanks for all the good information.  I bit the bullet and bought the Behringer UMC404HD (202 not available anymore & I hope sometime to do 4 part simultaneous recording).  The result is that I can't get the 4.0 ms audio latency that Hans reports on his Windows machine.  But I can get close  6.3

The other variable I've just been playing with is the clock rate - go to Applications-Utilities-AudioMidiSetup - and I change this from the default of 192,000 down to 48,000Hz.  Then did the same as you did, adjusting the Frame Size to the 1ms experimental option.   At the 192,000 clock (sample rate?) it resulted in very high latency - 35ms.   At the 48,000Hz setting I got the Audio Latency down to 6.3ms.   A friend using the Behringer UMC404 on a Windows 10 machine (with the custom Behringer driver) reports an audio latency on JamKazam of 4.0ms    I don't know if this difference is because the Windows 10 machine is newer,bigger, faster - or if it is the operating system - Core Audio differences.

On a related note, Focusrite that makes the Scarlet USB audio interface, has a "small program" that reduces the size of the Mac Core Audio buffer.  https://support.focusrite.com/hc/en-gb/a...ces-on-Mac
They claim it can shave 1 ms off the audio latency.  Has anyone used this ?

Hi Moose. I have installed that Focusrite 'small program' and it has indeed shaved about 2 ms off the latency showing for my Scarlett 2i4 (down to 7.8ms).. I'm still experiencing glitchy audio problems on JK, Can't say for sure but I don't think the update you mentioned has made it any worse (it's a clicking noise on long notes from my jam partners which they also hear from me. It's not present on the .ogg files in the recordings. Still investigating and looking elsewhere on the forum as it may not be a latency issue).