I'm not much of an audio buff, but I'm not a noob either. Looks to me like you have a couple of problems:
1) you're trying to use an opamp as an audio amplifier. While opamps are GREAT for the front end, they don't drive any power, most rated less than 20mA on the outputs, and the TL072 output swing is 13.5V into 10k = about 1.35mA.
2) It looks like what you have constructed is a preamp, that needs to drive the log taper pot, the center tap of which needs to drive an audio amp (Like the LM386 or the TPA6138)