Mo... I understand about the weight concerns....

These controllers are VERY light weight, so no problem there... I would suggest, at a store that sells the things in your area, you bring in your MIDI information about your arranger, and have a talk with the salesman there. For a fee, he might program up what you want, or show you so you can do it yourself, or suggest a MIDI 'guru' in the area that could be hired for the job.

In all fairness, for what you want to do 'live' (although they are handy for home programming sessions, the tools in your arranger WILL do the job just fine, it's live you really miss the faders, isn't it?!), it's a fairly simple task to program the faders to send volume (or expression), pan, reverb send, chorus send, etc., for each Part channel in your arranger. and Keyboard Parts.

Sys-ex is a bit more complicated, but most arrangers can be controlled fairly extensively without it, especially the Roland's (haven't dug too deep into Yamaha, but I imagine it's roughly the same), so it's no more difficult to learn than the arranger's OS anyway!

Don't pass up the chance to get back the control you want without breaking your back......