The DX11 was one of the models that Yamaha flooded the market with after the success of the DX7.
The DX9, 11, 21 and (my favorite) the tiny DX100 had 4-operator FM engines rather than the 6 the DX7 had.
Even with only 4 however, they generated most of the patch you wanted, just without some of the subtleties the extra two provided.
All of the DX'es can load complete patches over MIDI or from cartridge. The 4-ops also have a cassette port.
I can attest that there is nothing more tedious on Earth than trying to load/unload DX patches to/from cassette.
I kept and still keep all mine in Galaxy +Editors. It and SoundDiver both work perfectly.
I had a very early synth-enhanced band using two DX-100's and Roland TR-707 and 727 drum machines.
We had me on guitar, a keyboard player with a DX-7 and two chicks which gave us 4 singers - all thru one big SR system with no amps onstage.
It sounds pretty routine now, but back
then (late 80's) it was pretty radical.
We were early students of the ups and downs of playing "follow the sequencer".