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Yes, this is possible.

You may want to refer to the following link: https://github.com/mpflaga/Arduino-BioFeedBack/blob/master/Examples/MP3Player/MP3Player.ino as it loads the audio mixer plugin, which takes Audio IN and plays it out the output.
<table class=”highlight tab-size-8 js-file-line-container”>
<td class=”blob-code js-file-line” id=”LC77″><span class=”pl-k”>if</span> (MP3player.<span class=”pl-s3″>ADMixerLoad</span>(<span class=”pl-s1″><span class=”pl-pds”>”</span>admxster.053<span class=”pl-pds”>”</span></span>) == <span class=”pl-c1″>0</span>) {</td>
<td class=”blob-code js-file-line” id=”LC78″>MP3player.<span class=”pl-s3″>ADMixerVol</span>(-<span class=”pl-c1″>3</span>);</td>
<td class=”blob-code js-file-line” id=”LC79″>}</td>
This was built on a Mega2560 custom board that I made.  But was basics apply to any board and shield.

As for inputs you will need additional inputs, more than a UNO. You could either use a Mega for the buttons. Or use extra chip. such as http://www.arduino.cc/en/Tutorial/ShiftIn or https://www.sparkfun.com/products/11733

I would also suggest using Capacitive Touch input. https://www.sparkfun.com/products/9695. with a bit of Copper foil tape under the plastic with a wire to the Cap Sens. I have been using it very successfully. Removes any mechanical tooling and parts to buy. https://learn.sparkfun.com/tutorials/mpr121-hookup-guide?_ga=1.45861219.674176085.1386568569