The limits of 44.1k, filters and latency

[Sokel]

Looks like this one is clipped (should be ESS minimum phase fast rolloff filter).
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Also, most analog measurements (including AP) cannot reveal the whole stopband shape without using more advanced methods, and give a false impression that most filters in your screenshot for example only have 90dB attenuation. You can see that how @pkane used a specialized signal to get 120dB attenuation, the real attenuation depth of for example, ESS linear phase fast rolloff filter.

Beta Test: Multitone Loopback Analyzer software

Would it be relatively simple in Multitone to have it show not just FR, but also phase? I know you do this in Deltawave which works quite well, but testing phase with a spaced tones using a test signal would be a nice addition. Or should I just keep using Deltawave for this?

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Yes,this way (in dbfs,the previous was dbr) seems better.

Yes,it was probably clipped,E-mu is very sensitive near 1V.