My precious Yamaha RS 7000.
I once had a month where I got out of bed 5:30 Am everyday, and the first 30 minutes of the day, I improvised “unprepared” on the machine - no thinking, planning or ego involved. I knew the machine so well, that I could finish a track in that timeframe. Because of the early hours I was still in a twilight zone, and it was like another person made the music. A new person every day.
Highly Recommended (the machine and the process 
)
I should do it again.