Very short test. Just got a HexBoard and the initial goal is to add expression using a controller that is a set of switches that outputs Midi Note On/Note Off messages with controllable velocity. This is very reasonably priced compared to the more expensive hex controllers, but does support MPE (however they need to add channel pressure support for EaganMatrix MPE playing - which they are doing with some other features like limiting max MPE channel). But the device will play fine on Channel 1 mode (though the MPE modes above are required for it to play microtonally over MPE).
The goal here is adding expression to the control. Here I use a Genki Wave Ring with Wavefront Module to add vibrato on macro ii (which I programmed into the "VlnVlaVlcBass 2" preset) and used a TEC breath controller to add dynamic volume support through controlling Post Level gain. Some limitations for polyphonic playing on channel 1, but overall works ok.