I use it several ways. I use it with my Hammond SK1 to provide great styles along with alternate voices to the Hammond. With the press of one button on the SK1, I switch to the bank of favorite voices which I set up in banks of 10 or so per page. This means no fumbling at all.

The second way is using the SD40 as a full arranger slave with many song registrations I made up in playlists, available immediately by entering a number. I can set up the regs to include or mute any part, if I am using one of my keyboards to play a part also, or, of coarse, both.

The third way is with my Notate Composer 3 notation program I have in my tablets and laptops. I simply connect an interface to my computer in socket to play the midi, and a midi cable to the keyboard in socket of the SD40 and out to keyboard. This works great with the Pa4X to play style registrations of the korg or Midi songs immediately, and with no interference between the two.

The fourth way is to use the SD40 for singing Karaoke style from either midi, MP3, or CD&G or displaying lyrics for singing and playing my keyboard.

I like the fact that the SD40 connects to any midi mode, including accordion, without any hesitation or rebooting. I think it is great, especially since I sent it to AJ for his upgrade. Let me tell you, the addition of his instruments and supplemental material is a great addition to the factory voices, which are also very good.