  In this letter, we derive a new super Gaussian Joint Maximum a Posteriori
based single microphone speech enhancement gain function. The developed Speech
Enhancement method is implemented on a smartphone, and this arrangement
functions as an assistive device to hearing aids. We introduce a tradeoff
parameter in the derived gain function that allows the smartphone user to
customize their listening preference, by controlling the amount of noise
suppression and speech distortion in real-time based on their level of hearing
comfort perceived in noisy real world acoustic environment. Objective quality
and intelligibility measures show the effectiveness of the proposed method in
comparison to benchmark techniques considered in this paper. Subjective results
reflect the usefulness of the developed Speech Enhancement application in
real-world noisy conditions at signal to noise ratio levels of 0 dB and 5 dB.
