Hi Peter,
The short answer is YES!
I have a 756Pro, and I have an old BARTG R5 audio filter between the rig and
the soundcard.
Try it and you will see how much of a difference it makes to the waterfall
in MMTTY.
The DSP filters in the 756Pro series are good, but cleaning up the final
audio does seem to make that extra bit of difference.
I have a program called Gram which gives you a visual picture of the
signals, and you can see a difference when you switch in the external audio
filter.
You may find there are limitations if you use the built-in RTTY filter,
which I am told is better in the ProIII than in my basic Pro.
I also prefer the low tones, and the built in RTTY filters are limited to
high tones only.
It may be a bit "belt & braces", but I feel it is worth having.
Best 73
Phil GU0SUP
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