@bonemap Hi Russell I used to use Loopback but got into a bit of a mess as it seemed to play sound when I didn't want any! So I removed it to avoid complications. The Multi Output Device actually seems ok re latency when I have buffer set at 128 samples but it causes occasional digital distortion! I suppose I may try Loopback again. As you know I've been using your audio bloom effects which of course respond to frequency bands which I like. Thanks a s always for you expertise. Cheers, David