I started on that journey about 18 months ago.  It took me five months to have a useful software instrument, and I&#x27;ve spent the remaining time learning how to fab a suitable hardware controller.<p>Within the software, the hardest parts were understanding and controlling aliasing and getting a virtual ladder filter to perform well.<p>I already knew how to play piano, had a little music theory, and had spent a few hours playing with other people&#x27;s analog synths.