The software does seem interesting, but I am not sure what it offers beyond a standard spectrum analyzer run on a laptop. I guess, part is the excellent test record. The discussion above is great since it may actually give some more insight into this.
A comment on the DMM method: It doesn't work well unless you use a 1KHz bandbass filter for your 1KHz signal (assuming a 1KHz test track). There is too much noise in the background and the DMM integrates the noise over all frequencies. A much better way it to use a Laptop with a spectrum analyzer which allows to detect the 1KHz crosstalk signal directly .
A comment on the DMM method: It doesn't work well unless you use a 1KHz bandbass filter for your 1KHz signal (assuming a 1KHz test track). There is too much noise in the background and the DMM integrates the noise over all frequencies. A much better way it to use a Laptop with a spectrum analyzer which allows to detect the 1KHz crosstalk signal directly .