copying from the Maya manual I have a 12 frame sprite image sequence cycling but need the sprites to stay on for 4 frames each.
current creation expression: flo_particleShape.spriteNumPP = rand (1, 12);
current runtime expression: floparticleShape.spriteNumPP = (floparticleShape.spriteNumPP + 1) % 12;
btw. What is the % doing in this expression?

After spamming the site here is the source for my answer;
http://joshuamosley.com/tutorials/MayaBillboard/animatedBBinMaya.html
http://morganloomis.com/2010/tech-tip-tuesday-editing-image-plane-expressions/