I don’t know if this is helpful, but here it is.
Hearing Aids
• Whistle
• Chirp
Pro Fit Adjustments
• Initialize feedback cancellation with hearing aid in the ear
• Reduce Adaptive Feedback Cancellation Sensitivity (Strong to Subtle,
Subtle to Off) via the Feedback Canceller screen
• Reduce Overall Gain
Other Considerations
• Manage acoustic options for better fit and positioning of the
hearing aid in the ear
• Utilize Speech Mapping to identify feedback peak and decrease gain at peak
• Feedback cancellation needs to be re-initialized any time the acoustic
characteristics of the hearing aid are changed (e.g. shell modification,
new earmold)