sepheritoh wrote:I am having very poor results with rewire 64 bit and Notion with Sonar X2. Suddely I have crackling audio all over the place. I have a i7 processor with 16GB memory, and a Presonus FP10 firewire, so machine performance it is not. It worked fine in 32 bit. My only assumption is that the rewire drivers just does not work as advertised. I have no other 64 bit rewire programs, so it is not possible to narrow it down further. I tried playing with latency, but no improvement.
Try adjusting the buffer sizes, which for NOTION 4 will be on the "Audio" tab of "Preferences", where the default is "256 Samples", and for your external digital audio interface will be somewhere, probably in a hardware configuration dialog, but there should be a way in Sonar X2 to configure the external digital audio interface hardware . . .
And of course, as you know, you need to set the resolution for Sonar X2 to 44.1-kHz at 16-bits, which as best as I can determine at present is the resolution that NOTION 4 uses, since it is the resolution that NOTION 3 uses and I have not found anything to the contrary . . .
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NOTE: On the Mac when everything was 32-bits, the NOTION 3 default buffer size worked best here in the sound isolation studio, but with NOTION 4 everything is faster, so slightly smaller buffer sizes work, and this might be the case for Windows machines . . . ]
Lots of FUN! 
P. S. The ReWire 2 infrastructure comes from Propellerhead Software, but the application specific part of is done using components provided by Propellerhead Software but implemented by the third-party software engineers, which in the scenario you described will be Cakewalk and Notion Music, and if ReWIre 2 works with any host controller and slave in Windows, then it is not a problem with the Propellerhead Software infrastructure and components, where this also is the case on the Mac . . .
My focus is on the Mac, but
pcartwright can provide more information on what to do in Windows, since he reported that NOTION 4 is doing ReWire 2 "beautifully" with Reaper in Windows, which works for me with respect the "if it works in any scenario" aspect, where in this context "any" maps to "one", which is fabulous . . .
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NOTE: This is the Notion Music FORUM topic where pcartwright reports his stellar success, and it is particularly relevant to your problem, because pcartwright provides a key clue to the solution for configuring the Presonus FP10 . . . ]
Rewire (Notion Music FORUM)Fabulous! 