I just discovered this Windows VST plugin that simulates a dual tape deck delay system. Have spent the morning doing Terry Riley-style time-lag accumulation instead of work :-). Has 2 independent tape loops, a multimode filter on each channel, a tube and tape-hiss emulator, etc. Also check out the Sun Ra VST synth by the same programmer, very aptly named synth! Both are free, as are the other plugs on the same site. And they all rock.