On Thu, Jun 19, 2014 at 6:31 PM, Leonardo Gabrielli <l.gabrielli@univpm.it> wrote:

- with all 4 channels (I can afford some tinkering if needed)
- at least in USB1 compliant mode, i.e. stereo 16-bit 48kHz)

I had an Esi Maya 44 USB: it only has (unbalanced) RCA in/out, but its class compliant USB 1.1:

Always worked, no issues. If you don't need preams etc, I can recommend it, cost me 90 euros at the time IIRC.

HTH, -Harry