mousavi
I strongly recommend that use professional PCIe sound cards such as RME AIO instead of USB 2.0 audio interfaces or going with ZOOM UAC-2R which has ultra low-latency trough USB 3.0.

 
FWIW, There's a **HUGE** difference in quality between various USB-2 audio interfaces.
The best units (RME and MOTU) achieve very low round-trip latency... and you can sustain heavy loads glitch-free (assuming your DAW can sustain the load).
ie:  The MOTU Ultralite AVB yield 4.9ms total round-trip latency at a 64-sample ASIO buffer size/44.1k
The RME Fireface UFX (and derivatives) yield 4.9ms total round-trip latency at a 48-sample ASIO buffer size/44.1k
 
USB3 units are just starting to hit the street.
 
 

My 44VSL is working just fine. 7.3ms total roundtrip at 128 sample 48khz.

Is usb3c likely to show up this year? I read that it was quite a bit faster than usb 2 and seem to recall it would be faster than usb3.
I think 4.9 would be fine, as long as I could have reverb in the headphones while tracking vocals.
I also wonder if the Apollo Twin Duo usb will match that RTL.
Michael

pentimentosound
Is usb3c likely to show up this year? I read that it was quite a bit faster than usb 2 and seem to recall it would be faster than usb3.
I think 4.9 would be fine, as long as I could have reverb in the headphones while tracking vocals.
I also wonder if the Apollo Twin Duo usb will match that RTL.
 

To get round-trip latency significantly lower than 4.9ms, you have go down to a 32-sample ASIO buffer size.
Most USB2 units don't offer a 32-sample ASIO buffer size.
Also note that the unit must use a small (often hidden) safety-buffer.
If that buffer is larger, round-trip latency will be significantly higher.

Thanks Jim, I've read your posts about the hidden buffer. I guess I could be quite happy with 4.9 for quite a while.
LOL
Michael

Yeah, 4.9ms is definitely on the good (low) side.
Input monitoring thru software is comfortable.
Anything lower is gravy...  

Gravy sounds good! Anything warm...LOL It's went from mid 70's to chilly and brusk overnight.
 
Do you think the Apollo Twin Duo usb will come close to that 4.9 ms RTL?
Michael

Hi all.  Has anyone picked up a Presonus 192?  I've had one for a month or so now.. wanted to compare notes.  ; )

I have one.

Karyn.. what are your thoughts on the 192 so far.. good and bad?  ; )