[LAU] Linux/JACK app for room eq / speaker design-analysis

Hi, After spending time trying to get RoomEqWizard (REW) to use Jack effectively and simply getting frustrated I'm looking for other tools. (REW is a nice tool but it doesn't support JACK natively and I tried fooling it with alsa etc., but I think PulseAudio was getting in the way.) I ended up using jaaa and japa from Fons Adriensen which work great. But, I'd like to be able to save the display. I suppose I could use screen shots for each test and that would be fine. But, I thought I'd see if anyone knows a Linux tool that can do waterfall plots, frequency response, etc. Maybe even distortion. Any recommendations? Regards, Mac