that page has some examples of waterfalls of different modes.
definitely will help if you can ‘see’ a signal on the screen
and of course, you’ll need to tune the radio to where each ‘mode’ hangs out.
14.074 is ft8 so vfo ‘down’ to .070 for psk
psk activity is down quite a bit since the jt modes.
psk is still there though so google psk31 frequencies, to get some places to look for it.
don’t forget to set the mode you want in dm780 as well.
on my screen, in dm780, on the ‘main typing your message pane’;
next to the diskette icon is the mode currently selected, click that to select whichever mode you want.
down toward the bottom, AFC, should be turned on.
that way the decoder will follow any minor frequency shift.
lastly, way up to, there is a ‘super sweeper’ menu option, click that, then display.
that should open a windows that decodes every conversation within the radio passband all at once.