The sr-16 is from 1990. You'll be bored to death programming it and listening to it.
If you have a PC or iPhone, use it instead
Zoom is a good choice. It is always handy to have a recorder for rehearsals. But an external mic on a smartphone can do wonders.
“Please don’t make the mistake of thinking that the arts and sciences are at odds with one another. That is a recent, stupid and damaging idea..." Tim Minchin