Hello Craig...First...I was a fan back when Electronic Projects for Musicians came out! Where did the time go?
Anyway...I was a drummer for years and latency when trying to play a drum part on a virtual synth drives me nuts....I used to use an Atari with Hybrid Arts using all external synths, and there was no latency at all!
So my question is...does that Tascam US 20 x 20 with the USB 3.0 make a big difference? or should I just get a good USB 2.0 interface...
I've been using a Zoom R24 and it really has a lot of latency...works pretty well, but also is kinda quirky and Sonar really doesn't like it much..crashes a lot and takes forever to be recognized again by Sonar. 
I also am using a Fast Track C400 for now...tired of the Zoom problems and looking for something better
I really don't need a lot of inputs right now...just 2 to 4
Sooo...I know you just got the Tascam...is that a good choice, or should I just go for a 2.0 interface? I am a full time composer so it's not just a hobby.
 
Thanks for your thoughts

if you are looking for the BEST....
 
for latency....with usb....
 
seems the RME is the one you should be looking at.
 

Why are you limiting your post to Craig? shouldn't you just send him a PM if you only want his advice?

Sorry , didn't know how to do that :)  Thanks...I just saw it at the top of the page...But, I'll take anybody's advice...I just knew he  bought one recently and thought he might have a good take on it by now...do you have any suggestions? I'm  open for suggestions :)

If you're looking for the lowest possible round-trip latency with a USB audio interface, you need to look at MOTU or RME.

• The MOTU AVB series yields 4.9ms total round-trip latency at a 64-samples ASIO buffer size/44.1k
• The RME UBS units yield 4.3ms total round-trip latency at a 48-sample ASIO buffer size/44.1k

At those buffer sizes, that's on-par with PCIe units.
As long as your machine can keep up with the load, performance will be glitch-free.
 
The best PCIe audio interfaces let you take the ASIO buffer size down to 32 or even 16-samples.
That's sub 3ms total round-trip latency.
 
If lowest possible round-trip latency is paramount to your workflow, don't skimp on the audio interface.
In this scenario, lesser units won't do.
Go with a proven rock-solid performer... and you'll never give the audio interface a second thought.
 
Aside from the PC itself, the audio interface is the second most critical choice in a rock-solid DAW.
 
 

Jim, I never hear much about PCIe interfaces apart from UAD's DSP Accelerator cards. Are many companies still even making them?

I can vouch for the MOTU Ultralite AVB. My PC can't really handle the 64 sample 4.9ms RT latencies - but it's happy at 7.8ms. The fact that the MOTU drivers can go that low, for a USB interface, is great.
Plus, the MOTU is a lot cheaper than a RME (UC for example) here in the UK.

Thanks so much for your help guys!

The MOTU AVB is the next generation MOTU unit from what I have which is the Ultralite MK3.  they still manufacture the Ultralite MK3's but the AVB is newer (and a little more expensive).
 
there are several MOTU units available with the same technology as the Ultralite as well including the 4PRE and the Audio Express.
AVB ~$650
Ultralite ~$550
4PRE ~ $450
Audio Express ~$400
or if you're brave you can try finding a used one on ebay.
 
I use the MOTU Ultralite MK3 in USB mode (in firewire mode I get "noise" on my system for some reason) and I can get it down to 64 samples 4.9msec latency under most circumstances.
 
for a CHEAP unit, I have a backup that I bought and used when my MOTU had to be repaired (it's a few years old).  my backup unit is a presonus USB audiobox ~$100
 
I had purchased a focusrite 2i2 butI really didn't like the gain control on it and took it back and got the presonus, however a LOT of people do like the focusrite stuff, I"m in the minority on that one.  they're ~$150

If you have an extra PCIe slot get the rme hdsp 9652. It's even better than a usb 2.0 for latency.  Btw RME supports their products for very long periods of time..does the unicorn??  I'd hate to unload a bunch of dough and then see there are no drivers for it next year.  RME continues to write drivers for  products that were made for xp. JRR shop has the HDSPe AIO (which is probably the best option) for $849.  I don't think we're allowed to post linx.