PRESIDENT SILENT ON PLAN ON TAPES
Pres Nixon and special Watergate prosecutor A Cox make no visible progress on Sept 14 toward proposed out-of-ct compromise of their dispute over Watergate tape recordings; Cox's office repts that there was no contact with Nixon legal staff on Sept 14 in response to Sept 13 proposal by US Appeals ct; 2 possible interpretations of ct's proposal discussed; White House and Cox's office are understood to have ordered lines of communications kept open over weekend in effort to negotiate possible out-of-ct settlement by ct's Sept 20 deadline