To me, serial metering is a kludge. Taps are the way. Metering is a visual form of monitoring. I would like to see jack provide the ability to tap any port, input or output, audio or control data, for monitoring purposes. This monitoring could be meters, solo while tracking, control room outs, and anything else that ardour doesn't do. Monitoring doesn't have any dependencies downstream, so graph issues are minimal. Maybe the client api could include a way of allowing clients to write to jack monitor buffers, so that each client doesn't need to implement its own metering/monitoring/solo scheme. Tom