Is the audio on the PCE White amplified?

[gtsamour]

I read on the net that the "little chip on the back" of the white pcengine pcb which is a c358c, is a sound amplifier.

But from my poking around with the continuity tester, the pins for audio (R and L)  on the expansion port of the pce white, go straight to two pins (one for R and one for L) of the CPU which produces the sfx (6280). So to my understanding, what you get from the audio pins on the expansion port, is what comes out of the 6280 cpu without going through an amplifier....

Which one is correct?