i have bookmarked a page hosted by a user here, DSL-MAN, where you can download NAVA schematic. Thanks to him

https://www.dsl-man.de/display/DSO/Nava+TR-909+Clone
Kind regards,
Thanks, also spoted this one, and it's cheaperItchy wrote:I bought this, it works really well..
http://www.thomann.de/se/presonus_netzt ... c_200078_0