matching speed and accl between 2 sd 70-2m locos

have two sd70-2m genesis one with sound and one not what is the best way to set these up to use them in a conn s cant read the cv s on the faster loco got any ideas ???

Is the soudn one a newer one with Tsunami? You’ll have to set up a 28 step speed curve, cine Soundtraxx doesn’t see a reason to unclude CV5 for top speed and CV6 for mid speed to make for simple adjustments.

WHat decoder is int he non-sound one? I have a pair of Stewart FT’s, one with Tsunami and I put a TCS T-1 in the other, and they run nicely together withotu adjustment.

–Randy