This is a youtube video
of me improvising at a Yamaha P140 midi keyboard October 2012. The fantasia ends in C major and the piece is number 1813 of my midi-piano-roll pieces. Analysing improvisations like this led to the theory of music in book 1.
An early tape of pieces when I had access to real instruments, 1991, was assessed by Robert Elliott, director of keyboard studies, RNCM. He said there was a resemblance to music of French composers for organ associated with Messiaen, or where spacious and sonorous, American composers such as Copeland or Barber. I prefer real instruments.
With virtual instruments I find a tendency to lose concentration so that a piece falls into a familiar tune losing its independence. In this piece it might seem I was concentrating on what to play next. In fact, I was trying very hard not to let the piece be taken over by a popular tune that had taken over a number of previous pieces, It is much easier to avoid that with a real piano.
This midi-piano-roll improvisation begins with a single note originally meant for synchronisation purposes followed by a long rest. I found that note seemed part of the composition so I have not edited it out. The piano sound is a Synthogy Ivory sample on a computer fed by midi output of the P140.