I bought the Servonaut SMB and everything down to the correct horn (hupe) sound for an excavator track sounds too! Now I just need to tackle the install Im not clear on channel mixing yet, but I figured out how to set up my radio and a 4 channel receiver with a PPM SBUS to get 16 channels and got everything on the switches where I wanted them so next is to tackle channel mixing after I figure what happened with my tracks and hydraulic leak �� so much for almost RTR... I just couldn't spend another $2000 or $3000 for a radio when I could get a brand new 16 channel for $300 (well add another $20 for the SBUS PPM board) I'm very happy with it. Here's a short video.
https://youtu.be/g2MjRIVa-Uo