Tony,
The Mach 4 Galil plugin is fully supported by ArtSoft, as opposed to the forum based support for the Mach 3 Galil plugin. In order to do that, we have to charge a bit for the Mach 4 Galil plugin. With that said, we also had to make a decision as to what controller we could support. And that came down to basically the 41x3 and 40x0 controllers. Because one thing we learned with the Mach 3 plugin (those of us that wrote it) was that it is VERY difficult to support each and every model available from Galil. Also, Galil does a lot of custom controllers that are special ordered by companies that are configured to operated in their environment. A lot of times these controllers find their way to auction sites and then someone "wins" them and tries to use them with Mach. Most of these special controllers will never work with Mach be it version 3 or 4. And the guy that "won" it ends up being VERY disappointed. I cannot begin to explain the pain and grief that has cause. So for Mach 4 we talked to Galil about all of this stuff and agreed that only the above non-special ordered controllers would be supported.
So it is not a question of needing a tester for the 21x3 so that we can develop and support it. It can only use the Linear interpolation mode. And while there is code in the Mach 4 plugin to handle that, we can't say that it will forever work when the plugin is updated to take advantage of some new feature that is only available on the newer controllers. It just costs too much to merge a change into the plugin and make it work for both Contour Mode And Linear Interpolation Mode.
Steve