Can't believe this please help

Question

After two days and long nights, I finally completed a really good track I really love. For the drums I used logics internal instruments, Ultrabeat and EXS24.
For the horns and strings I used the external instruments from my Roland Keyboard. After mixing the track down I decided to burn it to a cd. To my surprise the only instruments I recorded or was able to hear on the cd was Logics internal instruments. What the ****, I could not believe it. What am I doing wrong. Please Help anyone, thanks.
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Answer 1

There is also a couple of ways to bounce your midi tracks without recording them on to an audio track. When I work with outboard midi gear and audio together, I send the synth into logic for monitoring to and input track. you can bounce that in real time, not off-line, along with your audio and instruments tracks.
in your environment create an audio object, double click it to view it as a channel strip. in the parameters box, under channel, you will select input channel instead of an output channel. select the stereo input you want to send your synth to. Assign the outputs to your main outs. From this channel you can monitor your outboard synth in Logic. And when you bounce in real time this input is sent to your outputs along with your VI’s and audio tracks
you can also do the same thing with an audio instrument channel. in the box (I/O) where you select your instrument choose External. and when the box pops up, select the inputs you want to use just like the input object. now you can monitor your outboard synths here also. you can also add track automation and plug in fx to this track as well.