声卡/音频接口

PreSonus的FireBox，接Motif-rack ES音源，在Cubase5下运行，在用耳机监听的情况下，只能听到软音源 和 电脑播放的声音，而魔笛ES音源的声音完全监听不到。但是用音箱监听就全部出声音。请问这是怎么回事呢？应该怎么设置。请达人详细指教。

说明书的第20页上关于软件混音器这个看看。
“The FIREBOX includes a software MIXER/
e it hits your software program. This is helpful to avoid  routing of the audio signal befor
are recording – called latency. Therefore,  the time it takes to process the audio you
you can mix the input signal going into the FIREBOX with the playback from your
software for zero latency recording and monitoring.


The default settings (pictured above) for the FIREBOX mixer has all faders set  NOTE:
Software Playback set to channels 1/2, the  to 0dB and all pans set to center, with the
ayback to Phones set to channels 1/2.”
如果你点最右边的那列关于耳机的下面那个mix to phones按钮，可能就听到了。