The ketron SD4 can have 3 instruments palying at one time. The presets with a group of 3 strings sound excellent to me. dim pro doesnt even compare in my opinion and this is just my opinion.
I have a song that has some violyns in the chorus. Im almost done with it. The music part is done and im writting lyrics to it now. I should have it ready in about 10 days or so.
Cj
Edit, n the group ones. you can control each instrument s volume, reverb and so on. Thats what i liike about that