@zappsunzorn: I guess it's halfway secure. But you're right, and I already thougt about that. I won't get all my stuff down there. Just my guitar amp and a desk, that'' be all. I'll take my laptop, my good ol' tascam and my mics down there every time a have a session. I can do the mixing in my room anyway ... @fab: thanks, I heard about thermohanf. Seems to be healthier than rockwool, too. I'll guess I'll build 2-3 movable walls so that I can arrange a little cabine, bass traps and cover some walls (and the floor) with old carpets ... @stupeT: Shure, I'll make an A/B-camparison :-) Cheers, M