IN_EFFECT_START_NID
ECHO_CANCELLATION = IN_EFFECT_START_NID,
if ((nid >= IN_EFFECT_START_NID) && (nid < IN_EFFECT_END_NID)) {
i = IN_EFFECT_START_NID - EFFECT_START_NID;
nid = IN_EFFECT_START_NID;
((nid >= IN_EFFECT_START_NID) && (nid < IN_EFFECT_END_NID))) {
if (i == (ECHO_CANCELLATION - IN_EFFECT_START_NID +