Soloing is definitely possible. I realize how important this feature is. Even bigger plot... hmm... this would be more difficult - it would be hard to maintain the proper resolution at low frequencies - we already use extremely long FFTs to display the actual accurate response plot instead of an approximate (like many linear phase eqs do). Anyway, I put both your wishes on the list.
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Hubert Pietrzykowski
DSP Engineer
PSPaudioware.com