thanks for the comments on my other post. Generally I have to say that REAPER is a wonderful and easy to use tool to work with. I use it for quite a while now and I like it very much. Quite intuitive and well structured.
After upgrading to GPO 4 there is one strange effect: When routing different instruments to different channels Instr.1 to 1/2, Instr.2 to 3/4 etc.. I will get only the 1/2 track in normal mode. all others (3/4, 5/6...) seem to appear to be just the FX signal of the ambience. First hand they sound quite low and far away, if you increase the "send" level in ARIA, they become louder and you can hear that it's just the effect-signal, the original (dry) signal is somehow gone. It works when routing all tracks to 1/2.
Is that normal?