Utilization of a hard drive was Ketron and General Music breakthrough.

When I 1st heard the SD1, it literally blew my mind feature and sound wise. I was the Ketron X1 demonstrator and one of the 1st people to see the SD1 keyboard in the USA.

Since drums do not respond to chord changes, steaming/syncopated audio drum tracks direct from the hard drive, was genius.

When the question was asked, do we need audio drums ? I laugh a little because in my opinion the answer is YES. Dating back to 2001.