Hi, I was able to replace RtAudio with the last version : RtAudio 4.02. As always, it's highly experimental, but I think it works. With version 4.02, I believe it would be possible to add channel offset (ie. use 4 channels, from 6 to 12) on the input and output. My experience so far has been that the blocking functionality is no longer is no longer supported, is this a problem? If anyone is interested, I could add something to the –channels –in –out option like –channels(channelN,offsetN) and wrap it with my ASIO build on electro-music.com. Thanks, Philippe.