I have found a solution to the recording problem with Resolume using two Macs Pros. Here is how it works:
Mac Pro 1 is running Resolume and outputting on a third monitor. This third monitor output (currently 720p60, but it also works with 1080p30) is split using a Geffen DVI splitter. One DVI feed goes to my projector using a DVI to HDMI convertor. The other DVI feed goes to a Blackmagic DVI to SDI convertor. The SDI convertor is connected to the HD-SDI input of my MOTU V4HD on Mac Pro 2. The V4HD is also used as an audio mixer (since I am running Ableton LIve on Mac Pro 1). The combination of video and audio is then captured using Final Cut Pro in DVCPROHD 720p60. I use Digital Performer to mix the audio, which is recorded either as a stereo mixdown or multi-track. I then take the resulting audio-video clips and convert them for final output to 720p24 or 29.97, for edited music videos to be placed online.
It may sound like an overly complicated setup but it works. The great thing about this setup is that it works both for live performance or for the recording process, which is very important to my creative work flow in the studio. Please don't hesitate to ask questions or comment, I am always searching for ways to improve my configuration. Thanks!
Mac Pro 8-core, 14 Gb ram, ATI Radeon 5770 graphics card, AJA Kona Lhe