I was really blown away with the speed and stability of the FireFace UCX over USB. I can now use Looper and play perfectly in sync with Ping-Pong delay. At a buffer size of 32 samples @ 44100, Live is reporting < 2ms round trip, and I believe it. The latency is low enough that I can’t tell the amplification apart from the instrument's natural sound until it is taken away. The TotalMix software is really incredible.
At the risk of being reprimanded for resurrecting a zombie thread, this info is crucial to me...
As it stands, I'm use a Scarlett 2i4 (bought it in a hurry to suit my needs at the time)... I was looking at getting the KMI K-Mix, but live looping is the most crucial aspect of the rig I'm building. Looking at the K-mix website, "The internal latency of K-Mix is about 2.3 ms (passing the input through the DSP to the output). You can expect about 8.5ms total latency when sending an input up USB to your computer, and then back to the K-Mix outputs (at 96 kHz, with a buffer of 64 samples)."
so that seems totally unnaceptable... With my 2i4 I'm looking at just under 8ms round-trip latency (reported in live at least)...
After reading this thread, it looks like I need to spend $1,500 (best case scenario) on an RME fireface UCX... Unless anyone can chime in with similarly tiny latency with a cheaper card?
PS... I was so hyped for the K-Mix, bit of a shame that it looks like it won't work out...
PPS. I'm considering going to my local music/DJ store, and begging them to let me plug in all their smaller interfaces, to see what latency I can get... But moreso than just a low latency, I need rock-solid performance, cause this system will be used for a perform-everyday corporate gig on a ship in a few months.
Any advice or comments are welcome.