I use Laisdcc 6-pin, 8-pin, 21-pin and Next18 decoders with Prodigy Advance2 and have no problems at all. Just got to know you way around the Laisdcc CV Table and no problems. Their user instructions which are downloadable are not in the best English though. They remind me of the old joke when the Chinese waiter asked the customer if he liked his steak and the customer replied, "It was rubbery", to which the Chinese waiter replied, "I'm grad ru riked it." Back EMF CVs are different to a lot of mainstream but you can get better info from TCS as Laisdcc decoders are basically a Hong-Kong 'knock-off' of TCS decoders. TCS were, or maybe still are, pursuing litigation against Laisdcc. The Select is not the best of DCC controllers as it is very basic and doesn't let you do much with CVs.