Hello again.
Having managed to get Vegas Pro to record audio commentary, I find I have a situation where the recording is perfect for 2 seconds, then reduces in volume and sounds distant and has an echo as if it is being recorded in an empty room. (Vegas pro 14, build 270, 64 bit, windows 10). I have tried changing some settings but to no avail. Anyone got any thoughts as to what could be causing this? Thanks.