Speaker Beep for Lot Matrix Item Scan in RMS-POS

I would like the cashier to hear a beep sound when scanning a single bottle of soft drink.  This so as to prompt the cashier to either select, say, the 6-bot pack which has no upc code.  Note that I created a Lot Matrix item for the bottle and 6-pack.  If there is no sound to alert the cashier, they continue blindly scanning and it picks the first item in lot matrix window which happens to be the single bottle.  Wow, now we are selling the 6-pack for the price of the bottle because the cashier was not alerted with a sound.

Note that when I cancel the Lot Matrix property from both upc items (e.g. 123-BOT & 123-Pack), the POS beeps.  But I prefer the lot matrix smaller window display on top of the bigger POS screen.

Thanks for the help.

<Sam Merfi>