Here are some audio files of Trans-Pacific stations I've heard. All of these stations were received at coastal locations in Washington State and the Canadian province of British Columbia.
 
 

Freq	Station & Location	Description
531	2MC - Port Macquarie, Australia	ID, 1120 24/Aug/92
603	HLSA - Seoul, South Korea	ID & Time Signal, 1400 24/Oct/93
620	KGTL - Homer, Alaska	ID, 0700 13/Oct/94
639	2CS - Coff's Harbour, Australia	"6 to 11 at 2CS...", 1254 24/Aug/92
675	Vietnam	Time signal, ID in Vietnamese 1400 22/Sep/01 (via Chuck Hutton)
729	Jiangxi RGD, China	"Jiangxi Renmin Guangbo Diantai" IDs 1308 22/Sep/01
750	KFQD - Anchorage, Alaska	ID, date unknown (via Chuck Hutton)
756	1YA - Auckland, NZ	Radio New Zealand ID & news 1200 22/Sep/01 (via Chuck Hutton)
765	5CC - Port Lincoln, Australia	"Today's 5 double C" IDs, 1341 24/Aug/92
774	4TO - Townsville, Australia	Weather and surf reports, IDs, 1404 7/Aug/84
783	2YB - Wellington, NZ	"Access Radio" ID 1200 14/Jul/01
820	KCBF - Fairbanks, Alaska	ID, KGNW-Seattle in background, 0928 24/Oct/93
828	JOBB - Osaka, Japan	Local ID, 1320 9/Sep/94
870	KAIM-Honolulu	Final signoff, 1000 1/Jan/02 (via Patrick Martin)
909	RRI-Sorong, Indonesia	Audio 1340 24/Mar/02 (via Chuck Hutton)
954	JOKR - Tokyo, Japan	"TBS Radio" IDs, Top Ten Countdown show, many English words including song positions, 1231 4/Oct/97
999	RRI - Jakarta, Indonesia	"Song of the Coconut Isles" melody, brutal interference from KOMO-1000, 1259 13/Oct/96
1161	Taiwan	ID in Mandarin 1530 23/Mar/02 (via Chuck Hutton)
1188	2NZ - Invernell, Australia	Ad for business in Glen Innes, "...a 2NZ Flashback Sponsor", 8/Jul/79
1287	JOHR - Sapporo, Japan	"HBC" ID and time signal 1359 21/Mar/98
1332	4BU - Bundaberg, Australia	Sign-off announcement, 1300 5/Jul/83
1386	Tianjin RGD - China	"Tianjin Renmin Guangbo Diantai" ID and time signal, sign-off?, 1600 24/Oct/93
1575	VOA - Thailand,  AFN - Japan	Voice of America sign-off, then ID for US Armed Forces station 1600 17/Nov/96