the software is there becasue it is used to auto shutdown a pc or a mac incase of power loss and the battery is reaching it's limit. In some configurations a 900 will only have 15-20 minutes of runtime when it goes to battery, using the software you can set a predetermined time for the machine to be on battery that the UPS will initiate a automatic shutdown of the computer. The removal of the beep is just a minor feature in the software
Believe if you get the units that are designed for a home tv hookup instead of one that is designed for a PC/MAC environment the beep is not present or it is configurable via the frontpanel
That is correct, the APC home theater units (available at Sam's Club for around $110) can disable beep from the front panel. I have 4 of them and they are all configured that way. The front panel LED display also shows input voltage, input frequency, charge state (run time), and actual power being consumed in watts. Very nice units, to be sure.
A couple of my other (older) APC units can turn the sound off, and several of the even older units cannot turn the beep off, no matter what, and for those you have to learn to tolerate it, go take them off line, or disconnect the speaker internally.