[LAU] eyes verses ears

[Ralf Mardorf]

Visualisation is helpful for troubleshooting, if e.g. something does
sound distorted, then taking a look at a meterbridge could be
timesaving.
Phase correlation does ensure that the phases are ok for airplay.
However, visualisation isn't needed, but could be helpful.

For analog recordings measurements at least are needed for bias
calibration.

Regards,
Ralf