[LAU] open-source delay effects suggestions

I am looking for a delay effect to help create a sense of space around electronic instruments and close mic'ed acoustic instruments. In other words, something natural sounding, not an artificial sounding effect. Looking for recommendations for something in case I have overlooked something. The Harrison 3D triple delay looks like it might be what I had in mind, but I would prefer something open source. The Invada delay plugin seems like it might be OK, but I was hoping for a plugin with a wet/dry mix control so I could use different delay settings per instrument, rather than having a delay bus like you would for a reverb, and the Invada seems like it can only be used with a send/bus approach. Not unworkable, I would just have to set up multiple busses with different delay settings, have something like a far away, mid distance, close instruments kind of approach and just assign tracks to the different busses as appropriate. TAP stereo echo also looks like it might be OK for that, I have that inserted to check out. And Calf Vintage Delay, although I think I might end up having to use two of those plugins to get an early reflection effect, unless I am just not understanding correctly how the feedback parameter works. Anything I missed that I should check out? This Reaper plugin looks like what I think I want, but it is Windows only (although Wine is supported; not sure how that would play in Linux, though): The particular plugin is Readelay http://www.cockos.com/reaper/reaplugs/index.php -- Chris Caudle