Did you remove it because you didn't like it or because you upgraded to a better hardware?
Really did not have anything again using the STX, still think it's a great bang for the buck.
I did the swap to the NFB-15.32 for a lot of minor reasons.
I have some low impedance headphones and the 15.32 headphone output impedance is only 2-Ohms, compared to the STX's 10-Ohm.
I have 600-Ohm headphones and thought the 15.32 more powerful headphone amplifier might(?) drive them a little better.
The 15.32's dual DAC chips (WM8741) are 128SNR compared to the STX's DAC chips (PCM1792A) 124SNR.
The 15.32 being totally external, eliminated the very slight electrical noise in the audio signal.
The 15.32 gives me a volume knob right as my finger tips.
I justified the 15.32's expense by thinking I would be able to sell off the STX.
I have a Xonar DX laying around and it has the same audio processor as the STX,
so I could connect the DX to the 15.32 using S/PDIF (still be able to use the DX's headphone surround sound feature.
Also felt I had to try something new.