My problem is this, we service point of sale systems for gas stations. The POS emits a tone, or beeping noise, indicating when a gas pump needs to be turned on. One store has an employee that can not hear the tone, not due to volume but rather frequency. The system has a standard audio output jack, to allow external speakers/headphones for volume purposes. The system is proprietary and there are no hardware or software options available to modify the tone on the system. I need some device that can take that audio output, and convert it to either a tone of a different frequency (preferably adjustable) or some type of other alert (e.g. flashing light etc). Any suggestions?
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