This could be a "LOUDNESS BALANCING" portion of the Deus software for users with impaired hearing- Basically the idea is that the end user listens to a set of 5 to 10 tones (200 -1000Hz) and tells the software what is a "comfortable" listening level. Some folks have moderate, severe, or worse hearing above 750 Hz, and for them to hear the high tones accurately, they have to increase the OVERALL volume (Audio Reponse) which makes the low tones "too loud" which may mask, or cover up, a high-toned target if the end user is hunting in a heavily iron-laden area.
The software could present a tone, starting at 200 Hz, and the user could rate the tone as "too loud", "too soft", or "just right". After the user sets the inital comfort level by pressing up or down arrows, then an additional tone is presented after the 200 Hz tone, say at 300 Hz; then the user adjusts the 300 Hz perceived loudness level relative to the 200 Hz tone, and so on up to 1000 Hz. This is how we set the "comfort level" for new patients' hearing instruments - the patient tells US what is comfortable rather than a prescribed formula, or average, dictated by a hearing aid manufacturer. What results is better first-time-user acceptance of instruments, and less follow-up adjustments, which leads to greater overall patient satisfaction in the long haul.
This would be an option available to new and/or existing Deus users (possibly an update...V3.3???). XP would have limits in that they could not exceed a certain db level for the higher 500-1000Hz tones, something like 90-100dB, since the normal human ear is most sensitive (without noise-induced hearing loss) to the 500-3000Hz range.