(from http://www.cakewalk.com/products/sonar/whats-new.aspx)
SONAR X3’s brilliant audio engine captures the clarity and elegance of your music. Its inspiring smooth sound and sonic characteristics digitize your performances with the utmost precision. You can bounce your tracks down in minutes with our 64 bit double precision engine, record up to 196kHz with low latency monitoring, 

Any more info or actual metrics to back that up?
 
(And perhaps 196kHz is a typo and 192kHz was intended?)

AFAIK, the higher the sample rate, the lower the latency, as the buffers fill quicker.
 
I may have oversimplified this, though.

While that can be true for some audio device drivers, it is not so in cases where the buffer size expands compensatorily as sampling rate increases (even if the ADC's/DAC's filter group delay is shortened at double or quad rate). And in any case, that's the audio device driver's buffer, not the audio engine to which the above-quoted X3 blurb refers.

Some apps allow for sample-rate as high as 384kHz
Maybe X4  

Wanna know about about X3's touted "low latency monitoring".
 
(although I'd welcome any other performance-related info/metrics about X3)
 
[Edit: Have now changed topic title and the emphasized portion of quoted X3 marketing copy in my OP to (hopefully) make it clear that my inquiry relates to the advertized "low latency monitoring" feature (and not to the sampling rate).]

I think they're just marketing an existing feature rather than trying to indicate any updates have been made. They're not saying "lower latency monitoring," they're just saying "Sonar has low latency monitoring at sample rates up to..." which has been true for years. 

The sample rate is not gated to 192K internally in SONAR except in the default values populated in the UI :)
If an audio device supports a higher sample rate it should work fine via ASIO. In WDM you can just type in the sample rate in the UI I think. As long as the driver supports it it should work. 

Hi Noel, while that's interesting to know, thanks, it's not really the aspect/feature about which I was interested.
 
Any info on the "record... with low latency monitoring" feature in X3's audio engine?
 

I think you read too much into it. All its saying is you can record with low latency input monitoring in SONAR.
 

Noel, your post and my edit crossed.
 
What (how much) latency is imposed by the audio engine in X3 when monitoring inputs?