hi
the csmio/ip-a controller from cs-labs is analog +/- 10v closed loop controller. i believe the other control csmio/ip-s does also but i am sure of the ip-a the only draw back is the plug in for mach 4 isnt as far along as i would like i really like the product but there are a few things in lathe that are not supported yet and it has been quite some time. that being said i am using the controller for my mill upgrades and we shall see when the updated plugin comes out.