It might be as simple as that. I was trying to do it with program material in a very large ballroom.
What has worked best for you guys for doing delays in difficult situations? For starters it sounds like use pink, or pink under music. I guess I do a lot of clubs and etc and I have not had any delay finder issues before, so I have not thought about it.
On the digital question - I've experienced this before when there are two devices with totally independent digital systems. If I recall correctly those were very minor shifts that's caused. I'm no Yamaha networking expert myself... everything is on the Dante network clock, I suppose?
I just did a theater rig using DVS to smaart. I switched reference inputs between the desk (also a CL-5) and the DSP with no anomalies.
Everything on one dante network shares a clock from a master device. you can find which device is the master under the clock tab in Dante Controller. But as long as signal is flowing and there appear to be no blips, burps, or chirps, it's probably fine.
I think of the delay finder like early GPS systems, good to +/- 100 meters , alegorically. When it lies to you, 9 times out of 10 it's on account of some local acoustic phenomenon. It's too convenient to not use, but I give it a 3 point cross-check: what does the live IR look like, what is the slope of the phase trace @ nyquist, and is there broadband coherence?
You can change the length and averaging of the delay finder FFT (in V7+ at least). You could try reducing the fft size to window out spurious arrivals and also increase your averaging.
you'll never get a delay measurement on the subs, don't bother. See any number of other threads on this board. Best bet to stick your mic where you want them coincident to the mains, snap your reference delay and a trace to the mains there, and then dial the subs to meet the phase slope of the mains @ xover.