KORG is and stays very great in musician'world, I began to play synth on a M1 KORG and was very surprised by the quality and easiness of use with an external sequencer. I still have it, a must in music 's story.This machine is completely MAD, because you have more than 550 ROM PCM in 24 bits, but if you have a look in the documentation, you have on the AD model, banks RAM 1,RAM2,RAM3,ROM, CARD and you can plug your analog instruments like guitars in stereo or two different ones or different sources, it becomes NUMERIC and it is possible to mix them in the waves that is completely unbelievable, 50 performances by bank and 35 patches by bank, and 32 wave sequences by bank !!!!!! You can color your sound with other input sounds or use it to color your guitar sound with effects and surrealistic but efficient sounds with different shape and other cutoff and resonance filtering ......... I wrote several programs that never were written by anyone else, but anyway, you can mix your guitar sound in the stereo inputs and adjust the gain to blend it to other layered sound in a performance, that I recall 8 different in a patch, that can use 128 sequences of step sequenced noises or sounds or drums, it's crazy in the 80's !!!!!! And the quality of the sounds are still actually usable !!!!