The Dink Network

I don't think there's a way to tell when a sequence has finished (unfortunately), you can either try timing a wait which is dodgy as you said or I usually work around problems like this by 'faking' the sequence.

Instead of sp_seq use this:

sp_pframe(&sprite, 1);
wait(50);
sp_pframe(&sprite, 2);
wait(50);
sp_pframe(&sprite, 3);
wait(50);
sp_pframe(&sprite, 4);
wait(50);
sp_pframe(&sprite, 5);