Tentatively enable 16 audio inputs...  QJackCtl is now reporting a constant
25% load on my AMD FX8350, but System Monitor isn't showing anywhere near
that, for the most part no core is exceeding 15%, or 20% spikes, and most
hover at between 0% and 10% as if nothing were running...

I think QJackCtl is just mis-reporting it, although I may revise the input
port count downwards when I get around to testing it on a lesser machine...
Better default ADSR settings for audio items, to avoid that 'whoosh' sound on playback, or overl sudden stops...