Phases 4 and 8 of the tolt are replaced as shown in the diagram below. Laying' the horse from the canter into the flying pace requires some skill though, as timing of the aids is crucial. Standardbred pacers also show a very small delay in the placement of the hooves of a lateral pair of legs. The track records for pacers are a few seconds faster than those for their trotting counterparts. Unlike trotters, pacers don't have to worry about overreaching.
Standardbred horses can also learn to tolt, depending on their conformation.
These horses make excellent pleasure horses. There is no English translation available at this time. On the WWW, search for individual breeds that you are interested in.