iPad 4.2 Beta Airplay不能使用多個揚聲器?

Dear all:

我家裡有3個Airport Express，在之前3.2.2時可以透過一個名叫"Remote"的app連線iTunes並控制這三個喇叭(個別或同時出聲)，但在升級4.2 beta後，airplay超好用的說但卻只能選擇單一的喇叭，無法同時使用多個揚聲器，而且"Remote"的app也變得不正常使用，會Delay，請問各位大大有發生類似的情況嗎?，能幫我到開發者論壇或Feedback留言嗎?

以下是英文版本的問題，煩請有開發者帳號的大大協助轉貼，感激不盡~~

About iPad airplay can't use multiple speakers?

My iPad use the latest ios4.2 beta1 ,there is 3 airport express in my house.

In iOS 3.2 I can use the App "Remote" to control 3 speakers perfectly,but "Remote" even can install in ios4.2 ,not use smoothly.

After I upgrade iOS to 4.2, I can use Airplay to control each speaker without "Remote",but can't use multiple speakers at the same time. Is anyone like me?

Is there have any other solution can fix this problem?

Thanks!