Ok, then Jay just accidentally misspoke. The first part about the master volume making no difference starts to make sense with very low recording levels if people are running the master all the way up and there’s no settings attenuation, as they’d be forced to run the channel gain/trims very low to compensate while the record level would also be as low as the channels.
The part about weirdly flat waveforms I believe is a result of hotly-mastered tracks encounter’s Prime’s current shoddy audio processing combined with its additional limiter to prevent Elastique from clipping. I see that on the SC5000 and X1800 combo, too. They need to first add an easy -6dB pad and remove that player-end limiter, and then further work later on drastically improving the audio processing especially on the player sections, but I don’t think the digital out on them or the x1800 is totally immune, either.
Regardless, put the master volume at its unity (0 marking) on the Prime 4, run your levels at or over 0dBVu on the meters depending on the dynamics of the tracks, and you should be getting suitably-hot digital domain recordings. I would be surprised if it doesn’t start looking more normal… though people still need to remember that we’re talking digital here and 0dBVu is 18-20dB below the full scale clip brick wall.
Oh, and don’t turn up Booth or Zone over their pot 0’s, as you could clip those even if the master meter is kosher.