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FamiTracker
2A03, as well as any other sound chip, have limited range of frequencies which it can generate. Also, higher range means worse resolution, so while you can get lower notes very close to right (musical) frequencies, you cannot get higher notes anywhere near to right frequencies. So, G-9 is out of range of possible notes. And you barely could hear sound above 8th octave, anyway (some people simply can't).
icendragon probably meant that FamiTracker play any note which is out of range as lowest note possible.
Of course you can use any note of chromatic scale (12 pitches), but you limited in number of the octaves. You can't go very low or high octave. Usually there is no problem with higher octave limitation, though sometimes you will have problem with lower octave limitation on the pulse channels (you can solve the problem through transpose of whole track up).
You can play two octaves adjacent on your keyboard. On a qwerty keyboard, use Z-M (bottom row of keys) to play the lower of the octaves, and Q-I (second row from the top) to play the higher of the two octaves. The other two rows are used for black keys. If Z is C, then S is C#, etc.
You can see a diagram here:
[url=]http://tutorials.renoise.com/uploads/Renoise/vvoois_renoise_keyboard.s.png
