In init:

trummelcodecneeded = false;
trummelcodec_id = noone;

In update:
if trummelcodecneeded{
    trummelcodec = 17;
    trummelcodecmax = 3;

    trummelcodecsprite1 = sprite_get("idle");
    trummelcodecsprite2 = sprite_get("idle");


    //Page 0
    trummelcodecspeaker[0] = 1;
    trummelcodecexpression[0] = 0;

    trummelcodecline[0,1] = "Oh my, ";
    trummelcodecline[0,2] = "we ran into";
    trummelcodecline[0,3] = "another meme.";
    trummelcodecline[0,4] = "Say, Trummel?";

    //Page 1
    trummelcodecspeaker[1] = 2;
    trummelcodecexpression[1] = 0;

    trummelcodecline[1,1] = "what";
    trummelcodecline[1,2] = "";
    trummelcodecline[1,3] = "";
    trummelcodecline[1,4] = "";

    trummelcodecspeaker[2] = 1;
    trummelcodecexpression[2] = 2;

    trummelcodecline[2,1] = "Where does";
    trummelcodecline[2,2] = "Mario end";
    trummelcodecline[2,3] = "and Fred";
    trummelcodecline[2,4] = "begin?";

    trummelcodecspeaker[3] = 2;
    trummelcodecexpression[3] = 0;

    trummelcodecline[3,1] = "...";
    trummelcodecline[3,2] = "yes";
    trummelcodecline[3,3] = "";
    trummelcodecline[3,4] = "";
}