Hello Peter:
Regarding question 1,? when the throttle goes to idle it is the same as issuing a speed step 0 command and the momentum functionality takes over.
When the brake level is applied, the value in CV61 is used to accelerate the end of the momentum feature.?? For Soundtraxx Tsunami decoders there are multiple CVs that work in conjunction to simulate braking:
????? CV4 - Baseline braking rate?? (emulating momentum of the moving mass of a train when the throttle is at idle)
????? CV61 - F11 Braking rate when the F11 button is pressed. The throttle is set to 0, forcing the decoder to decelerate to a stop eventually.? This value is a subtraction or addition offset to CV4 depending on the sign of the value is CV61.
Econami decoders use CV4 and CV117? (see excellent article at .?? For whatever reason Econami and Tsunami use different CVs for the F11 brake rate offset.?? Go figure.
I hope I got this right, my apologies in advance if something is amiss.?? I did do my research.
Bob Morningstar