It appears to correctly save new input values, and to correctly display new and existing input values. It may be a while before I can do a listening test; speaking of which, I notice a Reverb on the toolbar--does this incorporate the Soundfont send values? If so, the listening test would go a lot faster.
Thanks.
(I answered my own question: the reverb does indeed use the send values. Very nice! But I can't turn it on or off reliably--I have to change presets to get it to respond to the checkbox. And the "Amount" seems to be set by the "send" levels and cannot be set manually, correct?
Thanks again!)