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Learning to duel.
Certain LCD squares can also hold dual-key commands. The TV device includes direct line input signals if you hold down INPUT and press a number from 0 to 6 on the keypad, while the VCR has the fame feature for inputs such as "Tuner", "Line 1" and "DV" on the keypad’s 0 to 5 buttons. Only Sony components come with these keys pre-programmed; owners of other brands may still learn new signals onto these buttons. The RECORD button may either be learned as a single-press button, or as an "accident proof" REC + PLAY combination.
I’m told that the AV2100 has twice the learning capacity of the AV2000 (which was already pretty good), making this a very competent remote for folks with large or diverse theater setups. Learning frequencies extend up to 500KHz (for control of Bang & Olufsen components) and can learn codes up to 250 bits long. Four powerful IR transmitters in the front of the remote ensure a strong and wide infrared signal for control of devices without directly aiming at them (this of course also depends on the quality and placement of the receiving device’s sensor).
If your home theater components don’t exactly match the arrangement Sony provides, you can reassign an existing component select button to a new device – for instance change VCR3 to a second CD player. When reassigning components everything converts – preset labels, IR codes etc., however the LCD will continue to show the previous device’s name (whatever the button is labeled) at the top. It is also possible to copy an entire device from one button to another, including all preset codes, channel macros (described later) and taught signals.