First, thanks for Jasuto, it's a really inovative product, i've just discovered it on iPod, then i was very happy to see it in my PC DAW ...
I explain my issue :
I've tested with differents DAW like Reaper, Flstudio, and there was an issue, to test it, create a sin and a speaker node ( really simple ), when my DAW is set to 44100 HZ no problem with the sound, sinusoid is pure like a crystal ^^, but when setting the project samplerate to 48000 Hz, an aliasing frequency appear.
I've made 2 FFT screenshot to illustrate it :
In the second image, you can see ( and ear ^^), frequencies near the 20.0 Khz.