Powerbook audio in/out: advice needed

I don't understand my 15" aluminum powerbook's audio in/out. I know that the input jack requires a far higher power signal than my nylon string Gibson solid body Chet Atkins CE guitar is able to generate, so I have to run the signal from my guitar through a pre-amp, to boost the signal high enough to allow it to lay a decent audio track into my favorite Macintosh sound editing program (www.felttip.com's Sound Studio.)
It's also vital to be able to simultaneously hear what I'm playing, while I record it. It seemed logical to assume I would be able to plug my Bose stereo headset into the headphone jack of my Powerbook and listen to what I'm playing while I'm laying the track down in Sound Studio...but the headphone jack is totally dead while I'm recording. However, after the recording is done, I can play the .aif back with Sound Studio (or, for that matter, with iTunes) and the headphones work great.
It appears that the Mac audio system is only able to do one thing at a time...either take in sound via the Input Jack, or output sound via the headphone jack....but not both, simultaneously. And it seems to me that having anything plugged into the input jack, deactivates the headphone jack.
Is this true, or am I doing something wrong....?

Without doubt the problem rests within the particular software you are using as the PB is indeed capable of "duplex" operation - i.e. it can output sound at the same time as it is recording.
Go into the preferences section of Sound Studio (not a programme I'm familiar with I have to say) and look for an item named "Playthrough" (or similar). Check this box and all should be well.
If you want to confirm that your PB does do record/play at the same time try downloading another audio programme (such as Amadeus) - when you hit the record button in that programme you can easily set the system for playthrough from the Settings area of the pop-up box.
Hopefully you'll manage to get things sorted out.
PowerBook G4   Mac OS X (10.4.4)   1.5GHz; 1 Gig RAM

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