I am very hard of hearing.
Is there a sound amplification app one can use with earbuds? Earbuds with a microphone for a Droid are a non-issue but I don't know where to find an inexpensive app to work with the hardware.
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If you have one of the supported phone models:
There's an app called voodoo sound.
The paid app comes without a requirement for a custom kernel (but needs root)
Both replace the audio codec's driver and allow fine tuning and to turn on formerly unused chip features (see description).